02-20-2022, 01:28 PM | #1 |
Drives: 1SS Summit White 6 speed Join Date: Jul 2017
Location: Gainesville GA
Posts: 579
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Random codes CEL P18C4 & U0401-71
Was driving and CEL turns on
Rev match feature doesn't turn on Rear camera doesn't turn on P18C4 gear position sensor low voltage U0401-71 anti-lock brakes Car is 6 speed with 38k miles Magnuson supercharged for over 10k miles no issues Anyone else have experience with these codes ?
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16 1SS M6 White
Magnuson 2.3 Heartbeat Roto Fab Solo Performance Cat deletes and Axleback Hurst short shifter #'s coming soon Riaction coilovers 1LE sway bars BMR mm BMR chassis brace Flow one 19" wheels wrapped in Mickey Thompsons 02 Z28 M6 35th anniversary 80k miles T-tops Leather Bolt ons Joy to drive this classic every day! Daily Driver |
02-20-2022, 01:39 PM | #2 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,701
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Weak battery perhaps? These issues are unrelated, and the codes popping up at the same time indicate a potential electrical problem, so the first thing I'd check on the cheap would be the battery.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
02-20-2022, 09:01 PM | #3 | |
Drives: 1SS Summit White 6 speed Join Date: Jul 2017
Location: Gainesville GA
Posts: 579
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Quote:
Well I replaced the battery about 8 months ago I don't drive the car more than about three times a month though I'll get it tested my next day off
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16 1SS M6 White
Magnuson 2.3 Heartbeat Roto Fab Solo Performance Cat deletes and Axleback Hurst short shifter #'s coming soon Riaction coilovers 1LE sway bars BMR mm BMR chassis brace Flow one 19" wheels wrapped in Mickey Thompsons 02 Z28 M6 35th anniversary 80k miles T-tops Leather Bolt ons Joy to drive this classic every day! Daily Driver |
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02-20-2022, 09:18 PM | #4 |
Drives: 2017 Camaro SS 1LE Join Date: Jan 2018
Location: Atlanta Area
Posts: 31
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Gear Position Sensor Circuit Invalid Data
Check the wiring harness for short to ground between sensor and ECM. Both codes should clear, not return, and current gear should display once short is repaired.
DTC Descriptor: Invalid Data Received From ECM DTC: U0401 Some devices are constantly receiving information from other devices through serial data communication network. The invalid data code will be set when a receiving device detects a discrepancy in information it receives from another device causing its integrity to be questioned. The symptom byte listed in the DTC Descriptor is for engineering reference only. No external circuit diagnosis is involved. Symptom Byte: 71 Invalid Data - This sub type is used by the Electronic Control Unit to indicate a signal was received with the corresponding validity bit equal to invalid or post processing of the signal determines it is invalid. Circuit: Gate Select Position (Gear Position Sensor, number 3) DTC: P18C4 - Short to Ground Circuit/System Description The gate select position sensor is a switching transistor mounted to the transmission extension housing. The four wire sensor interfaces directly with the Engine Control Module (ECM). The ECM supplies 5 volts to the Gate Select Position sensor on a 5 volt reference circuit and also provides a ground path on a low reference circuit. The sensor provides a Pulse Width Modulated (PWW) duty cycle to the ECM on two signal circuits that are proportional to the linear and radial position of the corresponding magnet assembly mounted to the shift shaft. The vehicle uses the gear position sensor information primarily for Active Rev Matching and Active Fuel Management. The ECM monitors the radial position signal 1 circuit for low and high voltage conditions. |
02-21-2022, 07:51 PM | #5 |
Drives: 1SS Summit White 6 speed Join Date: Jul 2017
Location: Gainesville GA
Posts: 579
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Thank you for detailed diagram and highlighting the two culprits.
I appreciate you taking time to help.
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16 1SS M6 White
Magnuson 2.3 Heartbeat Roto Fab Solo Performance Cat deletes and Axleback Hurst short shifter #'s coming soon Riaction coilovers 1LE sway bars BMR mm BMR chassis brace Flow one 19" wheels wrapped in Mickey Thompsons 02 Z28 M6 35th anniversary 80k miles T-tops Leather Bolt ons Joy to drive this classic every day! Daily Driver |
03-25-2023, 06:49 PM | #6 | |
Quote:
•P0734: 4th gear ratio incorrect •P18C6: Gear position sensor circuit 2 low voltage. -U0401-71: invalid data received from engine control module-invalid data So I took it chevy and it looks like the gear selector position sensor needed replacement, good thing I didn’t have to pay for it cause it was covered, but the service advisor said it was $1400, still waiting for the part and my car is still at the service. Did you ever get this issue solved? |
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01-05-2024, 05:47 PM | #7 |
Drives: 2017 1SS M6 Join Date: Jul 2023
Location: North Carolina
Posts: 124
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Im having this same issue with codes P0735 and P0729 which is 5th and 6th gear
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2017 1SS M6
~ Air Raid Cold Air Intake~ ~ 3" Corsa Extreme Catback Exhaust ~ |
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