Code
P0370
Generic
P — Powertrain
Timing Reference High Resolution Signal A
Views:
UK: 16
EN: 27
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or short in camshaft timing reference (high‑resolution) wiring
- Poor connector or corrosion at sensor/ECM connector
- Failed high‑resolution camshaft position sensor (CMP/Timing Reference sensor)
- Damaged or missing tone/reluctor ring or cam target
- Skipped or stretched timing belt/chain or damaged cam phaser
- Contaminated sensor (oil/metal debris) or mechanical interference
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P0370 stored
- Hard start or no‑start in some cases
- Rough idle, misfire or reduced engine power
- Poor drivability, hesitation or stumbling during acceleration
- Engine may go into limp (reduced power) mode
- Intermittent stalling or surging
What to check
- Retrieve freeze frame data and related codes; note engine speed and conditions when fault set
- Visual inspection of camshaft sensor, wiring harness, and connectors for damage, corrosion, contamination, or oil intrusion
- Check for additional timing/cam/crank-related codes (e.g., cam/crank out of sync)
- Backprobe sensor connector: verify reference voltage (usually 5 V), ground continuity and signal presence with key on/cranking
- Wiggle test wiring and connectors while monitoring signal for intermittent faults
- Inspect camshaft reluctor/target and timing belt/chain, look for missing teeth, damage, or oil/debris on target
Signal parameters
- Typical sensor output: digital pulse/square wave referenced to 0–5 V (sensor dependent; some systems use 0–12 V)
- Signal frequency and pulse rate vary with engine speed; expected increasing frequency with RPM (no fixed single frequency)
- Duty cycle typically near 50% for Hall/VR-turned-digital sensors; waveform should be clean, consistent and repeatable
- A secondary or index pulse may appear once per cam rotation depending on design (used for synchronization)
- Signal must return to 0 V (or ground reference) cleanly and not float or show excessive noise
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Check for related crank/cam codes and multiple events before proceeding.
- Visually inspect sensor, connector and harness for damage, oil contamination, corrosion, or loose pins. Repair as needed.
- With key ON (engine off), verify sensor reference voltage (commonly 5 V) and ground at the connector using a multimeter. Replace or repair wiring if voltage absent or unstable.
- Backprobe signal wire and monitor while cranking/starting: use oscilloscope for best results. Look for expected clean pulse train and index pulse. If signal absent or noisy, suspect sensor or wiring.
- Perform wiggle tests on harness/connector while monitoring signal to find intermittent shorts/opens.
- Check continuity and resistance of signal, reference and ground wires from sensor to ECM. Repair broken wires or corroded connectors.
- Inspect camshaft reluctor/target and timing components for missing teeth, damage, or timing offset. If mechanical timing appears incorrect (chain/belt jumped), perform timing verification and repair (re-time engine) before replacing electronics.
- If signal remains absent with known-good wiring, swap in a known-good sensor or bench-test suspect sensor per manufacturer procedure. Replace sensor if faulty.
- If wiring and sensor check OK, suspect ECM input/driver fault. Confirm with manufacturer diagnostic tests or ECM bench testing before replacement.
- Clear codes, perform a road or engine run test to confirm repair, and monitor live data/waveform for stability.
Likely causes
- Faulty high‑resolution camshaft position sensor (A)
- Broken or shorted signal/ground/ref voltage wire between sensor and ECM
- Loose, corroded or pushed‑out connector pins at sensor or ECM
- Damaged camshaft reluctor/timing wheel (missing teeth or debris)
- Timing chain/belt jumped teeth or failed tensioner causing incorrect cam position
- Oil‑soaked sensor or metal fragments stuck to sensor tip
Fault status
Status
ECM detected abnormal or missing high‑resolution Timing Reference Signal A (camshaft position) — waveform or voltage outside expected parameters.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0370
GWM
P — Powertrain
- Timer A signal failure
Views:
UK: 9
EN: 13
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or short in camshaft timing reference (high‑resolution) wiring
- Poor connector or corrosion at sensor/ECM connector
- Failed high‑resolution camshaft position sensor (CMP/Timing Reference sensor)
- Damaged or missing tone/reluctor ring or cam target
- Skipped or stretched timing belt/chain or damaged cam phaser
- Contaminated sensor (oil/metal debris) or mechanical interference
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P0370 stored
- Hard start or no‑start in some cases
- Rough idle, misfire or reduced engine power
- Poor drivability, hesitation or stumbling during acceleration
- Engine may go into limp (reduced power) mode
- Intermittent stalling or surging
What to check
- Retrieve freeze frame data and related codes; note engine speed and conditions when fault set
- Visual inspection of camshaft sensor, wiring harness, and connectors for damage, corrosion, contamination, or oil intrusion
- Check for additional timing/cam/crank-related codes (e.g., cam/crank out of sync)
- Backprobe sensor connector: verify reference voltage (usually 5 V), ground continuity and signal presence with key on/cranking
- Wiggle test wiring and connectors while monitoring signal for intermittent faults
- Inspect camshaft reluctor/target and timing belt/chain, look for missing teeth, damage, or oil/debris on target
Signal parameters
- Typical sensor output: digital pulse/square wave referenced to 0–5 V (sensor dependent; some systems use 0–12 V)
- Signal frequency and pulse rate vary with engine speed; expected increasing frequency with RPM (no fixed single frequency)
- Duty cycle typically near 50% for Hall/VR-turned-digital sensors; waveform should be clean, consistent and repeatable
- A secondary or index pulse may appear once per cam rotation depending on design (used for synchronization)
- Signal must return to 0 V (or ground reference) cleanly and not float or show excessive noise
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Check for related crank/cam codes and multiple events before proceeding.
- Visually inspect sensor, connector and harness for damage, oil contamination, corrosion, or loose pins. Repair as needed.
- With key ON (engine off), verify sensor reference voltage (commonly 5 V) and ground at the connector using a multimeter. Replace or repair wiring if voltage absent or unstable.
- Backprobe signal wire and monitor while cranking/starting: use oscilloscope for best results. Look for expected clean pulse train and index pulse. If signal absent or noisy, suspect sensor or wiring.
- Perform wiggle tests on harness/connector while monitoring signal to find intermittent shorts/opens.
- Check continuity and resistance of signal, reference and ground wires from sensor to ECM. Repair broken wires or corroded connectors.
- Inspect camshaft reluctor/target and timing components for missing teeth, damage, or timing offset. If mechanical timing appears incorrect (chain/belt jumped), perform timing verification and repair (re-time engine) before replacing electronics.
- If signal remains absent with known-good wiring, swap in a known-good sensor or bench-test suspect sensor per manufacturer procedure. Replace sensor if faulty.
- If wiring and sensor check OK, suspect ECM input/driver fault. Confirm with manufacturer diagnostic tests or ECM bench testing before replacement.
- Clear codes, perform a road or engine run test to confirm repair, and monitor live data/waveform for stability.
Likely causes
- Faulty high‑resolution camshaft position sensor (A)
- Broken or shorted signal/ground/ref voltage wire between sensor and ECM
- Loose, corroded or pushed‑out connector pins at sensor or ECM
- Damaged camshaft reluctor/timing wheel (missing teeth or debris)
- Timing chain/belt jumped teeth or failed tensioner causing incorrect cam position
- Oil‑soaked sensor or metal fragments stuck to sensor tip
Fault status
Status
ECM detected abnormal or missing high‑resolution Timing Reference Signal A (camshaft position) — waveform or voltage outside expected parameters.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
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Code
P0370
HUMMER
P — Powertrain
Timing Reference High Resolution Signal A Malfunction
Views:
UK: 8
EN: 17
RU: 11
AI status
Completed
Completed
100%
Causes
- Open or short in camshaft timing reference (high‑resolution) wiring
- Poor connector or corrosion at sensor/ECM connector
- Failed high‑resolution camshaft position sensor (CMP/Timing Reference sensor)
- Damaged or missing tone/reluctor ring or cam target
- Skipped or stretched timing belt/chain or damaged cam phaser
- Contaminated sensor (oil/metal debris) or mechanical interference
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P0370 stored
- Hard start or no‑start in some cases
- Rough idle, misfire or reduced engine power
- Poor drivability, hesitation or stumbling during acceleration
- Engine may go into limp (reduced power) mode
- Intermittent stalling or surging
What to check
- Retrieve freeze frame data and related codes; note engine speed and conditions when fault set
- Visual inspection of camshaft sensor, wiring harness, and connectors for damage, corrosion, contamination, or oil intrusion
- Check for additional timing/cam/crank-related codes (e.g., cam/crank out of sync)
- Backprobe sensor connector: verify reference voltage (usually 5 V), ground continuity and signal presence with key on/cranking
- Wiggle test wiring and connectors while monitoring signal for intermittent faults
- Inspect camshaft reluctor/target and timing belt/chain, look for missing teeth, damage, or oil/debris on target
Signal parameters
- Typical sensor output: digital pulse/square wave referenced to 0–5 V (sensor dependent; some systems use 0–12 V)
- Signal frequency and pulse rate vary with engine speed; expected increasing frequency with RPM (no fixed single frequency)
- Duty cycle typically near 50% for Hall/VR-turned-digital sensors; waveform should be clean, consistent and repeatable
- A secondary or index pulse may appear once per cam rotation depending on design (used for synchronization)
- Signal must return to 0 V (or ground reference) cleanly and not float or show excessive noise
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Check for related crank/cam codes and multiple events before proceeding.
- Visually inspect sensor, connector and harness for damage, oil contamination, corrosion, or loose pins. Repair as needed.
- With key ON (engine off), verify sensor reference voltage (commonly 5 V) and ground at the connector using a multimeter. Replace or repair wiring if voltage absent or unstable.
- Backprobe signal wire and monitor while cranking/starting: use oscilloscope for best results. Look for expected clean pulse train and index pulse. If signal absent or noisy, suspect sensor or wiring.
- Perform wiggle tests on harness/connector while monitoring signal to find intermittent shorts/opens.
- Check continuity and resistance of signal, reference and ground wires from sensor to ECM. Repair broken wires or corroded connectors.
- Inspect camshaft reluctor/target and timing components for missing teeth, damage, or timing offset. If mechanical timing appears incorrect (chain/belt jumped), perform timing verification and repair (re-time engine) before replacing electronics.
- If signal remains absent with known-good wiring, swap in a known-good sensor or bench-test suspect sensor per manufacturer procedure. Replace sensor if faulty.
- If wiring and sensor check OK, suspect ECM input/driver fault. Confirm with manufacturer diagnostic tests or ECM bench testing before replacement.
- Clear codes, perform a road or engine run test to confirm repair, and monitor live data/waveform for stability.
Likely causes
- Faulty high‑resolution camshaft position sensor (A)
- Broken or shorted signal/ground/ref voltage wire between sensor and ECM
- Loose, corroded or pushed‑out connector pins at sensor or ECM
- Damaged camshaft reluctor/timing wheel (missing teeth or debris)
- Timing chain/belt jumped teeth or failed tensioner causing incorrect cam position
- Oil‑soaked sensor or metal fragments stuck to sensor tip
Fault status
Status
ECM detected abnormal or missing high‑resolution Timing Reference Signal A (camshaft position) — waveform or voltage outside expected parameters.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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