P0D74 code meaning
A/C Compressor Control Module Internal Temperature Sensor A Circuit Intermittent/Erratic
What P0D74 means
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.
P0D74 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0D74
- Air conditioning cuts out now and then
- Code appears sporadically
Common causes of P0D74
- PossibleCold or cracked solder joint on the compressor board
- PossibleLoose low-voltage connector or ground at the compressor
- Less likelyElectrical interference on the sensor signal
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac compressor cm internal temp sensor aAc compressor module
What each part of P0D74 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 74 | The exact fault in that area. |
What to do next
- Note P0D74 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0D74
What does P0D74 mean?
P0D74 means "A/C Compressor Control Module Internal Temperature Sensor A Circuit Intermittent/Erratic". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D74?
P0D74 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0D74 fail an emissions test?
P0D74 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0D74 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0D74 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.