P0D77
A/C Compressor Control Module Output Driver Temperature Sensor Circuit High
The ECM detects a high fault on the a/c compressor control module output driver temperature sensor circuit. Reading cannot be used reliably for control.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to B+Common
- Open sensorPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- AC Compressor Cm Output Driver Temp Sensor
- Wiring Harness
- AC Compressor Module
P0D77 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.