Faulty or contaminated wheel speed sensor or its wiring; ABS module internal failure or loss of communication with the PCM; Damaged or corroded wiring between the ABS module and the PCM; Failed rough road sensor (if equipped) or its circuit; PCM software issue or internal fault; Low battery voltage or poor grounds affecting module communication; Aftermarket modifications or poor electrical connections interfering with the data bus

DTC codes / GM codes / P1380

P1380 · GMMisfire Detected Rough Road Data Not Available

Q: What does code P1380 mean?

Misfire Detected Rough Road Data Not Available. P1380 on a GM vehicle means the powertrain control module (PCM) has detected a misfire but cannot confirm whether the road surface is rough because the rough road data signal is missing or invalid. The PCM uses this signal from the antilock brake system (ABS) module to distinguish genuine engine misfires from vibration caused by rough roads, and without it the misfire detection logic is compromised.

P1380 on a GM vehicle means the powertrain control module (PCM) has detected a misfire but cannot confirm whether the road surface is rough because the rough road data signal is missing or invalid. The PCM uses this signal from the antilock brake system (ABS) module to distinguish genuine engine misfires from vibration caused by rough roads, and without it the misfire detection logic is compromised.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough running or hesitation if an actual misfire is present
Reduced engine performance or power
Possible flashing check engine light if the misfire is severe
Traction control or ABS warning light may also be on if the ABS module is at fault
Poor fuel economy or increased emissions in some cases

Common causes, most likely first

Faulty or contaminated wheel speed sensor or its wiring
ABS module internal failure or loss of communication with the PCM
Damaged or corroded wiring between the ABS module and the PCM
Failed rough road sensor (if equipped) or its circuit
PCM software issue or internal fault
Low battery voltage or poor grounds affecting module communication
Aftermarket modifications or poor electrical connections interfering with the data bus

How to diagnose and fix it

Scan all modules for stored codes, especially in the ABS system, to identify related faults
Inspect and test the wheel speed sensors and their wiring for damage or corrosion
Check the ABS module for power, ground, and communication integrity
Verify the rough road data signal is present and correct using a scan tool with live data
Inspect the wiring harness between the ABS module and PCM for continuity and shorts
Reprogram or replace the PCM if software or internal faults are confirmed
Clear codes and perform a road test to verify the repair

Rough Road Signal Misfire Diagnostics

A P1380 often appears alongside ABS wheel speed sensor codes, so always check the ABS system first before condemning the PCM.
The rough road signal is derived from wheel speed sensors; a single faulty sensor can disable the misfire detection logic and set this code.
This code does not always indicate an actual engine misfire; it may be stored simply because the PCM cannot verify road conditions.
Corroded grounds or a weak battery can cause communication errors between modules, leading to a false P1380.
After replacing an ABS module or PCM, the system may require calibration or programming to restore proper rough road data communication.

Can I keep driving with P1380?

You can usually continue driving if the engine runs smoothly, but avoid heavy acceleration or towing until the fault is repaired. If the check engine light is flashing or the engine runs poorly, stop driving and seek service immediately to prevent catalytic converter damage.

Tools that help

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Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.