P0D76: A/C Compressor Control Module Output Driver Temperature Sensor Performance

P0D76 checks whether the compressor's output driver (IGBT) temperature sensor agrees with other temperatures after a cold soak. GM's 2011 Volt fails it when the IGBT reading differs from outside air by more than 11 °C and from the CPU sensor by more than 7 °C after the compressor has been off for over 21,600 s, with coolant and outside air within 15 °C of each other; 35 of 40 samples at 250 ms. The 2016 Volt uses 22 °C for both comparisons after 7,200 s off, the 2016 ELR 15 °C, and the 2019 Volt 22 °C in 8 of 10 s, where every comparison must fail together. Each is Type B, MIL after two trips. Causes: drifting sensor, wrong reference value, residual heat. Range codes are P0D77 and P0D78.

Symptoms

• Check engine light after two trips
• Usually no noticeable change in A/C operation

Most likely causes

• Drifting IGBT temperature sensor in the compressor inverter
• Outside air or CPU temperature used for comparison is wrong
• Power stage still warm when the test ran

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the battery and grounds
2. Compare the reading with other engine data while varying the engine speed.
3. Clear the code and see if it returns
4. If it is a reference voltage code, disconnect sensors one at a time and see if the voltage recovers
5. Check whether a software update is available
6. Do not replace the control module without a full diagnosis

What each character of P0D76 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• D: Subsystem depends on the code range
• 76: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0D76?

It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

What causes code P0D76?

The most common causes are: drifting IGBT temperature sensor in the compressor inverter; outside air or CPU temperature used for comparison is wrong; power stage still warm when the test ran.

Related codes

• P0D75A/C Compressor Control Module Output Driver Temperature Sensor Circuit
• P0D77A/C Compressor Control Module Output Driver Temperature Sensor Circuit High
• P0D78A/C Compressor Control Module Output Driver Temperature Sensor Circuit Low
• P0D71A/C Compressor Control Module Internal Temperature Sensor A Performance
• P0072Ambient Air Temperature Sensor Circuit A Low
• P0073Ambient Air Temperature Sensor Circuit A High

Sources

• gsi.ext.gm.com: 11OBDG01 HYBRID Diagnostics
• gsi.ext.gm.com: 16OBDG01 Hybrid Diagnostics
• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.