The most common causes of P1C26 include: Thermal management system malfunction; Coolant pump or valve failure; Temperature sensor reading out of range; Heat pump compressor fault. A professional OBD-II scan tool is recommended for accurate diagnosis.

How do I fix P1C26 for Chevrolet / GM Lyriq?

Recommended steps to address P1C26: (1) Schedule service as soon as possible (2) Reduce driving speed and avoid long trips (3) Monitor for additional warning messages (4) Have the vehicle diagnosed by a certified technician. Always consult a qualified EV technician for high-voltage system repairs.

Is it safe to drive with P1C26?

Driving with P1C26 is not recommended for extended distances. Schedule service within a few days to prevent further damage. Monitor for any additional warning lights.

Chevrolet / GM Lyriq

P1C26

Warning

High Voltage Battery Thermal Management System Fault

Severity

Warning

What does P1C26 mean?

Fault code P1C26 means "High Voltage Battery Thermal Management System Fault". This is a General Motors-specific EV diagnostic trouble code for the GM Ultium / BEV3 platform. It is classified as "hvac" with a severity level of "warning". Applicable models: Chevrolet Equinox EV (2024+), Chevrolet Blazer EV (2024+), Honda Prologue (2024+), Cadillac Lyriq (2023+), Chevrolet Silverado EV (2024+).

Possible Causes

Thermal management system malfunction
Coolant pump or valve failure
Temperature sensor reading out of range
Heat pump compressor fault

Recommended Actions

1 Schedule service as soon as possible
2 Reduce driving speed and avoid long trips
3 Monitor for additional warning messages
4 Have the vehicle diagnosed by a certified technician

This code applies to all vehicles. View generic P1C26 information →