GT350 CAN Bus Topology

CAN bus table (VERIFIED)

The following table are all verified values. Many unverified values are listed in the "CAN bus register details" section of this wiki.

		Hex Address	Position					Y = mX + b		Range		Sampling Rate
Address Name	Field Name		Start	End	Length (bits)	Direction	Data Format	Data Scale (m)	Data Offset (b)	Start	End		Description
GT350_STEERING_ANGLE	STEERING_ANGLE_DEG	76	B1[0]	B0[6]	15	Big-Endian	Unsigned Integer	-0.1	1600	-450	450	50 Hz	Steering angle (degrees)
	STEERING_ANGLE_RAD	76	B1[0]	B0[6]	15	Big-Endian	Unsigned Integer	-0.00174533	27.92528	-7.854	7.854	50 Hz	Steering angle (radians)
	REVERSE_SW	76	B1[7]		1		Bit					50 Hz	1=Reverse engaged
GT350_SPEEDOMETER	SPEEDOMETER_KPH	77	B1[0]	B0[7]	16	Big-Endian	Unsigned integer	0.01	0.00	0.000	656.000	50 Hz	Speedometer (KPH)? Very likely speedometer. Seems to have about a 3.3% fudge factor with respect to wheel speed sensors.
	SPEEDOMETER_MPH	77	B1[0]	B0[7]	16	Big-Endian	Unsigned integer	0.00621371	0.00	0.000	408.000	50 Hz	Same as above (MPH)
GT350_BRAKE_PRESSURE	BRAKE_PRESSURE_BAR	7D	B1[0]	B0[5]	14	Big-Endian	Unsigned Integer	0.025	0	0.0	409.6	50 Hz	Brake pressure (bar)
	BRAKE_PRESSURE_KPA	7D	B1[0]	B0[5]	14	Big-Endian	Unsigned Integer	2.5	0	0.0	40960	50 Hz	Brake pressure (kPa)
	BRAKE_PRESSURE_PSI	7D	B1[0]	B0[5]	14	Big-Endian	Unsigned Integer	0.362595	0	0.00	5940.75	50 Hz	Brake pressure (psi)
GT350_ENGINE_TEMPS_01	COOLANT_TEMP_C	156	B0[0]	B0[7]	8	Big-Endian	Unsigned Integer	1	-60.00	-60.00	195.00	10 Hz	Coolant temperature (deg-C)
	COOLANT_TEMP_K	156	B0[0]	B0[7]	8	Big-Endian	Unsigned Integer	1	213.15	213.15	468.15	10 Hz	Coolant temperature (deg-K)
	COOLANT_TEMP_F	156	B0[0]	B0[7]	8	Big-Endian	Unsigned Integer	1.80	-76.00	-76.00	383.00	10 Hz	Coolant temperature (deg-F)
	UNKNOWN_TEMP_C	156	B1[0]	B1[7]	8	Big-Endian	Unsigned Integer	1	-60.00	-60.00	195.00	10 Hz	Unknown temperature sensor (deg-C)
GT350_WEATHER	AMBIENT_TEMP_C	178	B5[0]	B4[1]	10	Big-Endian	Unsigned Integer	0.25	-128.00	-128.00	128.00	10 Hz	Ambient temperature (deg-C)
	AMBIENT_TEMP_K	178	B5[0]	B4[1]	10	Big-Endian	Unsigned Integer	0.25	145.15	145.15	401.15	10 Hz	Ambient temperature (deg-K)
	AMBIENT_TEMP_F	178	B5[0]	B4[1]	10	Big-Endian	Unsigned Integer	0.45	-198.40	-198.40	262.40	10 Hz	Ambient temperature (deg-F)
	AMBIENT_PRESSURE_MBAR	178	B6[0]	B6[7]	8	Big-Endian	Unsigned Integer	2.50	500.00	500.00	1140.00	10 Hz	Ambient pressure (mBar)
	AMBIENT_PRESSURE_KPA	178	B6[0]	B6[7]	8	Big-Endian	Unsigned Integer	0.25	50.00	50.00	114.00	10 Hz	Ambient pressure (kPa)
	AMBIENT_PRESSURE_MBAR	178	B6[0]	B6[7]	8	Big-Endian	Unsigned Integer	0.073825	14.765	14.765	33.664	10 Hz	Ambient pressure (inHg)
	UNKNOWN_TEMP	178	B7[0]	B7[7]	8	Big-Endian	Unsigned Integer	TBD	TBD	TBD	TBD	10 Hz	Unknown sensor; seems to be temperature related
GT350_RPM_TPS	THROTTLE_POSITION	204	B1[0]	B0[1]	10	Big-Endian	Unsigned Integer	0.10	0.00	0.00	102.30	80 Hz	Throttle position (%)
	ENGINE_RPM	204	B4[0]	B3[4]	13	Big-Endian	Unsigned Integer	2.00	0.00	0.00	16384.00	80 Hz	Engine RPM
GT350_213_MOTION	LONG_ACCELERATION_G	213	B6[0]	B5[1]	10	Big-Endian	Unsigned Integer	0.0078125	-3.9921875	-4.000	4.000	50 Hz	Longitudinal acceleration (G)
GT350_WHEEL_ROTATION	WHL_01	216	B0[0]	B0[7]	8	Big-Endian	Unsigned Integer					50 Hz	Some type of wheel rotation sensors. Monotonically increments while wheels are in motion. Starts at 0 when car is turned on. Does not return to 0 when car is not in motion. Seem to count rotation, or partial rotation of each wheel.
	WHL_02	216	B1[0]	B1[7]	8	Big-Endian	Unsigned Integer					50 Hz	Same as above
	WHL_03	216	B2[0]	B2[7]	8	Big-Endian	Unsigned Integer					50 Hz	Same as above
	WHL_04	216	B3[0]	B3[7]	8	Big-Endian	Unsigned Integer					50 Hz	Same as above
GT350_WHEEL_SPEEDS	WHLSPD_FRNT_DRV_KPH	217	B1[0]	B0[6]	15	Big-Endian	Unsigned Integer	0.012	0.00	0.00	394.00	80 Hz	Wheel speed sensor (front, driver, KPH)
	WHLSPD_FRNT_DRV_MPH	217	B1[0]	B0[6]	15	Big-Endian	Unsigned Integer	0.007456452	0.00	0.00	245.00	80 Hz	Wheel speed sensor (front, driver, MPH)
	WHLSPD_FRNT_PAS_KPH	217	B3[0]	B2[6]	15	Big-Endian	Unsigned Integer	0.012	0.00	0.00	394.00	80 Hz	Wheel speed sensor (front, passenger, KPH)
	WHLSPD_FRNT_PAS_MPH	217	B3[0]	B2[6]	15	Big-Endian	Unsigned Integer	0.007456452	0.00	0.00	245.00	80 Hz	Wheel speed sensor (front, passenger, MPH)
	WHLSPD_REAR_DRV_KPH	217	B5[0]	B4[6]	15	Big-Endian	Unsigned Integer	0.012	0.00	0.00	394.00	80 Hz	Wheel speed sensor (rear, driver, KPH)
	WHLSPD_REAR_DRV_MPH	217	B5[0]	B4[6]	15	Big-Endian	Unsigned Integer	0.007456452	0.00	0.00	245.00	80 Hz	Wheel speed sensor (rear, driver, MPH)
	WHLSPD_REAR_PAS_KPH	217	B7[0]	B6[6]	15	Big-Endian	Unsigned Integer	0.012	0.00	0.00	394.00	80 Hz	Wheel speed sensor (rear, passenger, KPH)
	WHLSPD_REAR_PAS_MPH	217	B7[0]	B6[6]	15	Big-Endian	Unsigned Integer	0.007456452	0.00	0.00	245.00	80 Hz	Wheel speed sensor (rear, passenger, MPH)
GT350_TRANSMISSION	TBD	230	B0[4]	B0[7]	4	Big-Endian	Unsigned Integer						Seems to be clutch related because it changes value at the approximate times the clutch is being engaged and disengaged.
	TRANSMISSION_TEMP_C	230	B4[0]	B4[7]	8	Big-Endian	Unsigned Integer	1	-60.00	-60.00	195.00	50 Hz	Transmission Temperature (deg-C)
	TRANSMISSION_TEMP_K	230	B4[0]	B4[7]	8	Big-Endian	Unsigned Integer	1	213.15	213.15	498.15	50 Hz	Transmission Temperature (deg-K)
	TRANSMISSION_TEMP_F	230	B4[0]	B4[7]	8	Big-Endian	Unsigned Integer	1	-76.00	-76.00	383.00	50 Hz	Transmission Temperature (deg-F)
GT350_ENGINE_LAMBDA?	Lambda?	242	B3[0]	B2[4]	13	Big-Endian	Signed 2's complement integer					25 Hz	Possible engine lambda (AFR) sensor.
	TBD	242	B2[5]	B2[7]	3							25 Hz	There is some type of 3-bit field here
GT350_ALTIMETER?	Altimeter?	326	B3[0]	B2[1]	10							1 Hz	Possible altimeter, but really just a wild guess at this point.

---

CAN bus register details

Each section below lists one CAN bus register, each byte, and each bit. Some values are known and verified; other values are guesses or work-in-progress; and other values are completely unknown.

For known values, there will be a register description, datatype description, decoding formula, range of values, and possible notes of explanation. For both known, and unknown values, the following descriptions apply.

VALIDATED FIELDS

• Given a descriptive name
• Datatype will give full details how the data is formulated and decoded on the CAN bus
• Decoding formula in the form of "Y = mX + b"
• Range of possible values using standard math set notation with "[ ]" and "( )"
• Applicable notes where necessary

PARTIALLY UNKNOWN FIELDS

• Usually given the names in the form TBD_REGNUM_FIELDNUM. For example: TBD_077_01 or TBD_077_02 where '077' is the CAN bus address associated with this register, and '01' and '02' are the enumerated counts of the unknown fields.
• Usually I've figured out the datatype and will give a datatype definition.
• Sometimes I've figured out the decoding formula, but don't know what the data represents.
• Sometimes I'll make an educated or wild guess what I think is in this field.

COMPLETELY UNKNOWN FIELDS

• Will be shown as "?" in the register mappings below.
• Values marked with "?" will constantly be changing, but their contents are unknown.

HARD CODED FIELDS

• These values never seem to change; they are fixed values.
• Will be marked either "1" or "0" in the register mappings below.
• Their purpose is completely unknown.

ADDR: 041 -- GT350_041_TBD

	7	6	5	4	3	2	1	0
Byte-0	0	0	0	0	0	0	0	0
Byte-1	0	0	0	0	0	0	0	0
Byte-2	0	0	0	0	0	0	0	0
Byte-3	0	0	0	0	0	0	0	0
Byte-4	0	0	0	0	0	0	0	0
Byte-5	0	0	0	0	0	0	0	0
Byte-6	0	0	0	0	0	0	0	0
Byte-7	0	0	0	0	0	0	0	0

Fixed Values: HEX: 00 00 00 00 00 00 00 00

ADDR: 047 -- GT350_047_TBD

	7	6	5	4	3	2	1	0
Byte-0	0	0	1	0	0	0	0	0
Byte-1	0	0	0	0	0	0	0	0
Byte-2	0	0	0	0	0	0	0	0
Byte-3	0	0	0	0	0	0	0	0
Byte-4	0	0	0	0	0	0	0	0
Byte-5	0	0	0	0	0	0	0	0
Byte-6	0	0	0	0	0	0	0	0
Byte-7	0	0	0	0	0	0	0	0

Fixed Values: HEX: 20 00 00 00 00 00 00 00

ADDR: 04A -- GT350_04A_TBD

	7	6	5	4	3	2	1	0
Byte-0	0	0	0	0	0	0	1	0
Byte-1	0	0	0	0	0	0	0	0
Byte-2	0	0	0	0	0	0	0	0
Byte-3	0	0	0	0	0	0	0	0
Byte-4	0	0	0	0	0	0	0	0
Byte-5	0	0	0	0	0	0	0	0
Byte-6	0	0	0	0	0	0	0	0
Byte-7	0	0	0	0	0	0	0	0

Fixed Values: HEX: 02 00 00 00 00 00 00 00

ADDR: 04B -- GT350_04B_TBD

	7	6	5	4	3	2	1	0
Byte-0	0	0	0	0	0	0	0	0
Byte-1	1	1	0	0	0	0	0	0
Byte-2	1	1	0	1	1	0	0	0
Byte-3	1	1	0	1	1	0	0	0
Byte-4	1	1	0	1	1	0	0	0
Byte-5	1	1	0	1	1	0	0	0
Byte-6	1	1	0	0	0	0	0	0
Byte-7	0	0	0	0	0	0	0	0

Fixed Values: HEX: 00 C0 D8 D8 D8 D8 C0 00

ADDR: 04C -- GT350_04C_TBD

	7	6	5	4	3	2	1	0
Byte-0	0	0	1	0	0	0	0	0
Byte-1	UBIT_1_07	UBIT_1_06	1	0	1	1	1	1
Byte-2	1	1	1	1	1	1	1	1
Byte-3	0	0	0	0	0	0	0	0
Byte-4	0	0	0	0	0	0	0	0
Byte-5	0	0	0	0	0	0	0	0
Byte-6	0	0	0	0	0	0	0	0
Byte-7	0	0	0	0	0	0	0	0

UBIT_1_07: Unknown bit, byte-1, bit-7
UBIT_1_06: Unknown bit, byte-1, bit-6

FIXED FIELDS:

• Byte-0 HEX: 20
• Byte-2 HEX: FF
• Byte-3 HEX: 00
• Byte-4 HEX: 00
• Byte-5 HEX: 00
• Byte-6 HEX: 00
• Byte-7 HEX: 00

ADDR: 076 -- GT350_076_STEERING_ANGLE

	7	6	5	4	3	2	1	0
Byte-0	REVERSE_SW	STEERING_ANGLE [b14:b08]
Byte-1	STEERING_ANGLE [b07:b00]
Byte-2	1	1	0	0	0	0	0	0
Byte-3	0	0	0	0	0	0	0	0
Byte-4	UBIT_4_07	0	0	0	0	0	0	0
Byte-5	0	0	0	0	0	0	0	0
Byte-6	0	0	0	0	0	0	0	0
Byte-7	0	0	0	0	0	0	0	0

REVERSE_SW:

• Datatype: Boolean, 1-bit
• 1=Reverse engaged; 0=Reverse not engaged

STEERING_ANGLE:

• Datatype: Big-Endian, Unsigned integer, 15-bits
• Available as degrees or radians
• Y = mX + b: Degrees: m=-0.1, b=1600
• Y = mX + b: Radians: m=-0.00174533, b= 27.92528
• Practical Range: (-450, 450) Degrees, (-7.85, 7.85) Radians
• Theoretical Range: (-1600, 1600) Degrees, (-28, 28) Radians
• Notes: Degrees (radians) increase in clockwise direction of steering wheel

UBIT_4_07: Unknown bit, Byte-4, bit-7. Changes value, but purpose is unknown.

FIXED VALUES:

• Byte-2 HEX: C0
• Byte-3 HEX: 00
• Byte-5 HEX: 00
• Byte-6 HEX: 00
• Byte-7 HEX: 00

ADDR: 077 -- GT350_SPEEDOMETER

	7	6	5	4	3	2	1	0
Byte-0	SPEEDOMETER [b15:b08]
Byte-1	SPEEDOMETER [b07:b00]
Byte-2	?	?	?	?	?	?	?	?
Byte-3	?	?	?	?	?	?	?	?
Byte-4	?	?	?	?	?	?	?	?
Byte-5	?	?	?	?	?	?	?	?
Byte-6	?	?	?	?	?	?	?	?
Byte-7	?	?	?	?	?	?	?	?

SPEEDOMETER:

• Datatype: Big-Endian, Unsigned Integer, 16-bits
• Available as: Kilometers per hour (KPH), Miles per hour (MPH)
• Y = mX + b: KPH: m=0.01, b=0
• Y = mX + b: MPH: m=0.00621371, b=0
• Theoretical Range: [0, 656) KPH, [0, 408) MPH
• NOTES: Speedometer is an "estimate" based on the average wheel speed sensor values.

ADDR: 07D -- GT350_BRAKE_PRESSURE

	7	6	5	4	3	2	1	0
Byte-0	0	0	BRAKE_PRESSURE [b13:b08]
Byte-1	BRAKE_PRESSURE [b07:b00]
Byte-2	?	?	?	?	?	?	?	?
Byte-3	?	?	?	?	?	?	?	?
Byte-4	?	?	?	?	?	?	?	?
Byte-5	?	?	?	?	?	?	?	?
Byte-6	?	?	?	?	?	?	?	?
Byte-7	?	?	?	?	?	?	?	?

BRAKE_PRESSURE

• Datatype: Big-Endian, Unsigned Integer, 14-bits
• Available as: BAR, KPA, or PSI
• Y = mX + b: BAR: m=0.025, b=0
• Y = mX + b: KPA: m=2.5, b=0
• Y = mX + b: PSI: m=0.362595, b=0
• Practical Range: [0, 64] BAR, [0, 6400] KPA, [0, 928] PSI
• Theoretical Range: [0, 410) BAR, [0, 40960] KPA, [0, 5940) PSI
• Notes: The practical range and theoretical range are many orders of magnitude different. The 14-bit field will allow up to 410 BAR, but in the real word, I've never seen more than 64 BAR no matter how hard I pressed on the brake pedal.

ADDR: 156 -- GT350_ENGINE_TEMPS_01

	7	6	5	4	3	2	1	0
Byte-0	COOLANT_TEMP [b07:b00]
Byte-1	ENGINE_OIL_TEMP [b07:b00]
Byte-2	0	0	0	0	0	0	0	0
Byte-3	0	0	0	0	0	0	0	0
Byte-4	0	0	0	0	0	0	1	1
Byte-5	0	0	0	0	0	0	0	0
Byte-6	0	0	0	0	0	0	0	0
Byte-7	0	0	0	0	0	0	0	0

COOLANT_TEMP

• Datatype: Big-Endian, Unsigned Integer, 8-bits
• Available as: Celcius, Kelvin, or Farenheit
• Y = mX + b: Celcius (C): m=1.0, b=0
• Y = mX + b: Kelvin (K): m=213.15, b=0
• Y = mX + b: Farenheit (F): m=1.8, b=-76
• Theoretical Range: [-60, 195] deg-C, [213.15, 468.15] deg-K, [-76, 383] deg-F

ENGINE_OIL_TEMP

• Datatype: Big-Endian, Unsigned Integer, 8-bits
• Available as: Celcius, Kelvin, or Farenheit
• Y = mX + b: Celcius (C): m=1.0, b=0
• Y = mX + b: Kelvin (K): m=213.15, b=0
• Y = mX + b: Farenheit (F): m=1.8, b=-76
• Theoretical Range: [-60, 195] deg-C, [213.15, 468.15] deg-K, [-76, 383] deg-F

ADDR: TBD -- GT350_

	7	6	5	4	3	2	1	0
Byte-0
Byte-1
Byte-2
Byte-3
Byte-4
Byte-5
Byte-6
Byte-7