Code
P1565
HUMMER
P — Powertrain
Cruise Servo Position Sensor
Views:
UK: 25
EN: 36
RU: 32
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector or wiring (open, short to battery, short to ground, intermittent).
- Failed cruise servo position sensor (potentiometer, Hall-effect, or other position device).
- Faulty cruise servo / actuator (mechanical binding or internal electrical fault).
- Poor ground or reference voltage issue from the PCM/ECM.
- Faulty PCM/ECM or software calibration error (less common).
- Aftermarket equipment or recent repairs that disturbed wiring/ground.
Symptoms
- Cruise control will not engage, set, or resume.
- Cruise may disengage unexpectedly or be intermittent.
- MIL/CEL (Check Engine Light) may be illuminated and DTC stored.
- Possible limp or reduced functionality of cruise/throttle control features.
- Erratic or inconsistent throttle/servo movement during cruise commands.
What to check
- Retrieve freeze frame and all related codes with a scan tool; check for stored pending/related DTCs.
- Visual inspection of cruise servo, connector, and wiring for damage, corrosion, or pin push-out.
- Check for aftermarket devices or recent repairs that could affect wiring/grounds.
- Verify vehicle battery and charging system voltage is within normal range.
- Backprobe connector and measure reference voltage, ground continuity, and sensor output with multimeter/oscilloscope.
- Use scan tool to monitor cruise/servo position sensor values while commanding actuator (if tool supports).
Signal parameters
- Reference voltage typically ~5 V from the PCM (verify exact value in service manual).
- Position signal usually a variable DC voltage that changes smoothly with travel (example nominal range ~0.2–4.8 V depending on design).
- Signal should have no abrupt dropouts or steps and must correlate to commanded servo travel.
- Sensor may be a two-wire variable resistance (potentiometer) or three-wire (5 V ref, signal, ground) Hall-effect style — check manual for exact pinout.
- Any rapid jumping, frozen value, open (OL), or shorted-to-rail reading indicates a fault.
Diagnostic algorithm
- Verify the DTC: Connect a scan tool, record all stored and pending codes, and note freeze-frame data and driving conditions when the code set.
- Visual inspection: Inspect harness, connectors, and servo for damage, corrosion, or water intrusion. Repair any obvious issues.
- Check supply and ground: With ignition ON (engine off unless specified), backprobe the servo connector and confirm reference voltage from PCM and a good ground. Compare to specifications.
- Monitor sensor output: With connector connected, capture the sensor signal while moving the throttle/actuator by hand (if safe) or by commanding the servo with a scan tool. Signal should vary smoothly across the expected range.
- Wiggle test: While monitoring the signal, wiggle wiring and connector to reproduce intermittent faults. Repair any faults found.
- Isolate sensor: If wiring checks pass, disconnect the sensor and measure its internal resistance or output per service manual. Replace sensor if out of spec.
- Verify actuator mechanics: Confirm the servo moves freely and is not binding. Repair or replace mechanical components if necessary.
- Repair and retest: Repair wiring or replace sensor/servo as required. Clear codes, perform functional tests with scan tool, and road test to ensure DTC does not return.
- Module check: If problem persists after replacing sensor and repairing wiring, consider PCM/ECM diagnostics or software updates as directed by dealer service literature.
Likely causes
- Corroded/loose connector at cruise servo or damaged wiring harness.
- Failed position sensor in the cruise servo (worn potentiometer or failed Hall element).
- Mechanical binding in the servo preventing full travel, causing out-of-range readings.
Fault status
Status
Cruise servo position sensor circuit malfunction — position signal out of range or inconsistent with expected values.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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