Code
P0D71
Generic
P — Powertrain
A/C Compressor Control Module Internal Temperature Sensor A Performance
AI status
Completed
Completed
100%
Causes
- Faulty internal temperature sensor inside the A/C compressor control module
- Damaged wiring harness or connector (open, short to ground/voltage, corrosion)
- Poor power or ground to the compressor control module
- Water intrusion, contamination or mechanical damage to the module
- Intermittent connection or chafed wires due to vibration
- Module internal fault or failed sensor conditioning circuit
Symptoms
- A/C may run intermittently or be disabled by the control strategy
- Reduced compressor operation or cycling more frequently than normal
- Illumination of MIL or A/C warning indicator
- Stored DTC(s) related to A/C compressor control or temperature sensor
- HVAC performance degraded (reduced cooling or inconsistent cabin temperature)
What to check
- Retrieve freeze-frame and live data with a scan tool; note sensor temperature values and related A/C parameters
- Visually inspect compressor module, connector and wiring for corrosion, bent pins, damage, or water ingress
- Check module supply voltage and ground with key on/engine off
- Compare reported internal temperature to ambient and other temperature sensors (evaporator, ambient)
- Wiggle test wiring and connector while observing live data for intermittent faults
- Check for related stored codes that indicate wiring or power issues
Signal parameters
- Type: likely temperature sensor (NTC/thermistor) whose resistance changes with temperature
- Typical signal behavior: resistance decreases as temperature rises (NTC) and corresponding voltage changes proportionally
- Expected module signal voltage range: approx. 0.1–4.9 V depending on design
- Response time: signal should change smoothly with temperature changes; no large spikes or dropouts
- Open-circuit: sensor or wiring will show very high/OL resistance; short to ground or 5V will show near 0 Ω or fixed voltage
Diagnostic algorithm
- Safety first: disable A/C system and allow pressure to equalize before working on compressor or pressurized components
- Connect scan tool, confirm P0D71 and review freeze-frame and live data for internal temperature A
- Visually inspect compressor control module, connector and wiring for damage, corrosion, bent pins or moisture; repair as needed
- With connector disconnected, measure sensor circuit resistance at module harness if accessible — compare to manufacturer spec; if not available, check continuity to module and for shorts to ground/12V
- Check module supply voltage and ground integrity with key on; repair any poor power/ground connections
- If wiring and power are good, perform wiggle testing while monitoring live data to locate intermittent faults
- If sensor wiring and connections are OK but symptoms persist, consult manufacturer procedure for bench-testing or replacement of the compressor control module
- After repairs, clear codes and perform functional test cycles; re-check for reappearance of the code and verify proper A/C performance
Likely causes
- Corroded or loose connector at compressor control module
- Open or shorted sensor signal wire between sensor and module
- Failed temperature sensor element inside the compressor module
- Poor module ground or supply voltage issue
- Internal module electronics fault after exposure to moisture or heat
Fault status
Status
A/C compressor control module reports internal temperature sensor A performance problem — signal out of expected range or erratic.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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