P0D74A/C Compressor Control Module Internal Temperature Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- P0D74 reports an unsteady signal from the internal temperature sensor of the A/C compressor control module: the reading jumps or drops out in short bursts rather than sitting at one wrong value. No manufacturer publishes a threshold for P0D74. GM's 2019 Volt table names it, together with P0D71 to P0D73, as a fault that blocks other compressor diagnostics, which ties it to the same sensor, but it gives no set criteria. A Hyundai patent on temperature sensors of power switches describes how loose connectors, noise, board defects or cold solder joints produce exactly such erratic values. Because the sensor is part of the compressor electronics, a confirmed fault usually ends with a new assembly; check the 12 V supply, ground and data connections first.
- What you may notice
- Air conditioning cuts out now and then
- Code appears sporadically
- Likely causes
- PossibleCold or cracked solder joint on the compressor board
- PossibleLoose low-voltage connector or ground at the compressor
- RareElectrical interference on the sensor signal
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.