Code
P0340
Generic
P — Powertrain
Camshaft Position Sensor A Circuit Bank 1 or Single Sensor
Views:
UK: 24
EN: 42
RU: 39
AI status
Completed
Completed
100%
Causes
- Failed camshaft position sensor (Hall or VR type)
- Open, shorted or damaged wiring between sensor and PCM
- Corroded, loose or damaged sensor connector or pins
- Faulty power or ground supply to the sensor
- Missing/damaged reluctor/target on camshaft or excessive camshaft wear
- Incorrect cam/crank timing (timing chain/belt jump)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Hard starting, no-start or intermittent no-start
- Rough idle, misfire(s) or engine stumbling
- Loss of power or erratic throttle response
- Poor fuel economy
- Engine stalling at low speeds or immediately after start
What to check
- Scan PCM for P0340 and any related codes; record freeze-frame and live data
- Visual inspection of cam sensor, wiring harness and connector for damage, corrosion, oil intrusion or rodent damage
- Verify sensor retention and correct installation (not loose or contacting moving parts)
- Backprobe sensor connector to check reference voltage, ground and signal with key ON/cranking
- Measure sensor output with oscilloscope while cranking/idle to verify waveform shape and amplitude
- Check continuity and resistance between sensor terminals and PCM connector; inspect for shorts to power/ground
Signal parameters
- Hall-effect type: typically 5 V reference, signal is a digital/square wave toggling ~0–5 V as cam passes target (frequency proportional to engine speed)
- Variable reluctor (VR) type: AC voltage waveform; common idle/crank amplitudes ~0.2–1.5 VAC (varies by design), amplitude and frequency increase with engine speed
- Typical sensor resistance (VR sensors) often in the hundreds to low thousands of ohms — consult OEM spec; Hall sensors show low resistance for power/ground circuits and open circuit on signal when not driven
- Expected behavior: consistent pulses per engine revolution; missing pulses, flatline, or steady voltage indicate fault
Diagnostic algorithm
- Read and record all stored codes and freeze-frame data. Note whether code is current, pending or historical. Clear codes and perform a monitored re-test.
- Perform a thorough visual inspection of the cam sensor, connector and wiring loom for damage, oil ingress, corrosion, broken pins, or connector looseness. Repair as needed.
- With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage (usually ~5 V for Hall types), good ground, and no short to battery. Repair power/ground faults first.
- Crank the engine and observe signal with a digital multimeter (AC volts for VR) or, preferably, an oscilloscope for waveform verification. Look for clean, repeatable pulses. If no signal, suspect open/short or sensor failure.
- If sensor has measurable resistance spec, disconnect and measure sensor coil resistance (VR) or check for internal short/open per OEM spec. Replace if out of range.
- Perform a wiggle test: move wiring and connectors while monitoring signal to detect intermittent faults. Repair/replace damaged wiring or connector.
- Inspect camshaft target/reluctor and cam timing: check for missing teeth, debris, damaged reluctor, or timing-chain/belt jump. Verify cam/crank correlation using scan tool or oscilloscope (compare cam and crank waveforms).
- If wiring and sensor check OK and timing is correct, check PCM connector continuity and pin condition. If all circuits test good and symptoms persist, consider PCM diagnosis at specialist shop.
- Replace camshaft position sensor only after confirming wiring and mechanical timing are correct. After repair clear codes and road-test to verify proper operation.
Likely causes
- Broken or chafed harness conductor to cam sensor
- Connector corrosion or pushed-out pin causing intermittent contact
- Short to battery or chassis ground in the sensor signal circuit
- Sensor magnet or reluctor damaged by debris or metal shavings
- Sensor failed electrically (internal open, short or failed electronics)
- Timing chain/belt skipped teeth or variable cam timing actuator failure causing no expected pulse
Fault status
Status
Camshaft Position Sensor A Circuit Bank 1 (signal missing/invalid). Possible open/short/intermittent or sensor/timing problem.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0340
GWM
P — Powertrain
- Camshaft Position Sensor Circuit Malfunction
Views:
UK: 3
EN: 8
RU: 5
AI status
Completed
Completed
100%
Causes
- Failed camshaft position sensor (Hall or VR type)
- Open, shorted or damaged wiring between sensor and PCM
- Corroded, loose or damaged sensor connector or pins
- Faulty power or ground supply to the sensor
- Missing/damaged reluctor/target on camshaft or excessive camshaft wear
- Incorrect cam/crank timing (timing chain/belt jump)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Hard starting, no-start or intermittent no-start
- Rough idle, misfire(s) or engine stumbling
- Loss of power or erratic throttle response
- Poor fuel economy
- Engine stalling at low speeds or immediately after start
What to check
- Scan PCM for P0340 and any related codes; record freeze-frame and live data
- Visual inspection of cam sensor, wiring harness and connector for damage, corrosion, oil intrusion or rodent damage
- Verify sensor retention and correct installation (not loose or contacting moving parts)
- Backprobe sensor connector to check reference voltage, ground and signal with key ON/cranking
- Measure sensor output with oscilloscope while cranking/idle to verify waveform shape and amplitude
- Check continuity and resistance between sensor terminals and PCM connector; inspect for shorts to power/ground
Signal parameters
- Hall-effect type: typically 5 V reference, signal is a digital/square wave toggling ~0–5 V as cam passes target (frequency proportional to engine speed)
- Variable reluctor (VR) type: AC voltage waveform; common idle/crank amplitudes ~0.2–1.5 VAC (varies by design), amplitude and frequency increase with engine speed
- Typical sensor resistance (VR sensors) often in the hundreds to low thousands of ohms — consult OEM spec; Hall sensors show low resistance for power/ground circuits and open circuit on signal when not driven
- Expected behavior: consistent pulses per engine revolution; missing pulses, flatline, or steady voltage indicate fault
Diagnostic algorithm
- Read and record all stored codes and freeze-frame data. Note whether code is current, pending or historical. Clear codes and perform a monitored re-test.
- Perform a thorough visual inspection of the cam sensor, connector and wiring loom for damage, oil ingress, corrosion, broken pins, or connector looseness. Repair as needed.
- With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage (usually ~5 V for Hall types), good ground, and no short to battery. Repair power/ground faults first.
- Crank the engine and observe signal with a digital multimeter (AC volts for VR) or, preferably, an oscilloscope for waveform verification. Look for clean, repeatable pulses. If no signal, suspect open/short or sensor failure.
- If sensor has measurable resistance spec, disconnect and measure sensor coil resistance (VR) or check for internal short/open per OEM spec. Replace if out of range.
- Perform a wiggle test: move wiring and connectors while monitoring signal to detect intermittent faults. Repair/replace damaged wiring or connector.
- Inspect camshaft target/reluctor and cam timing: check for missing teeth, debris, damaged reluctor, or timing-chain/belt jump. Verify cam/crank correlation using scan tool or oscilloscope (compare cam and crank waveforms).
- If wiring and sensor check OK and timing is correct, check PCM connector continuity and pin condition. If all circuits test good and symptoms persist, consider PCM diagnosis at specialist shop.
- Replace camshaft position sensor only after confirming wiring and mechanical timing are correct. After repair clear codes and road-test to verify proper operation.
Likely causes
- Broken or chafed harness conductor to cam sensor
- Connector corrosion or pushed-out pin causing intermittent contact
- Short to battery or chassis ground in the sensor signal circuit
- Sensor magnet or reluctor damaged by debris or metal shavings
- Sensor failed electrically (internal open, short or failed electronics)
- Timing chain/belt skipped teeth or variable cam timing actuator failure causing no expected pulse
Fault status
Status
Camshaft Position Sensor A Circuit Bank 1 (signal missing/invalid). Possible open/short/intermittent or sensor/timing problem.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0340
HUMMER
P — Powertrain
Camshaft Position (CMP) Sensor Circuit
Views:
UK: 7
EN: 23
RU: 23
AI status
Completed
Completed
100%
Causes
- Failed camshaft position sensor (Hall or VR type)
- Open, shorted or damaged wiring between sensor and PCM
- Corroded, loose or damaged sensor connector or pins
- Faulty power or ground supply to the sensor
- Missing/damaged reluctor/target on camshaft or excessive camshaft wear
- Incorrect cam/crank timing (timing chain/belt jump)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Hard starting, no-start or intermittent no-start
- Rough idle, misfire(s) or engine stumbling
- Loss of power or erratic throttle response
- Poor fuel economy
- Engine stalling at low speeds or immediately after start
What to check
- Scan PCM for P0340 and any related codes; record freeze-frame and live data
- Visual inspection of cam sensor, wiring harness and connector for damage, corrosion, oil intrusion or rodent damage
- Verify sensor retention and correct installation (not loose or contacting moving parts)
- Backprobe sensor connector to check reference voltage, ground and signal with key ON/cranking
- Measure sensor output with oscilloscope while cranking/idle to verify waveform shape and amplitude
- Check continuity and resistance between sensor terminals and PCM connector; inspect for shorts to power/ground
Signal parameters
- Hall-effect type: typically 5 V reference, signal is a digital/square wave toggling ~0–5 V as cam passes target (frequency proportional to engine speed)
- Variable reluctor (VR) type: AC voltage waveform; common idle/crank amplitudes ~0.2–1.5 VAC (varies by design), amplitude and frequency increase with engine speed
- Typical sensor resistance (VR sensors) often in the hundreds to low thousands of ohms — consult OEM spec; Hall sensors show low resistance for power/ground circuits and open circuit on signal when not driven
- Expected behavior: consistent pulses per engine revolution; missing pulses, flatline, or steady voltage indicate fault
Diagnostic algorithm
- Read and record all stored codes and freeze-frame data. Note whether code is current, pending or historical. Clear codes and perform a monitored re-test.
- Perform a thorough visual inspection of the cam sensor, connector and wiring loom for damage, oil ingress, corrosion, broken pins, or connector looseness. Repair as needed.
- With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage (usually ~5 V for Hall types), good ground, and no short to battery. Repair power/ground faults first.
- Crank the engine and observe signal with a digital multimeter (AC volts for VR) or, preferably, an oscilloscope for waveform verification. Look for clean, repeatable pulses. If no signal, suspect open/short or sensor failure.
- If sensor has measurable resistance spec, disconnect and measure sensor coil resistance (VR) or check for internal short/open per OEM spec. Replace if out of range.
- Perform a wiggle test: move wiring and connectors while monitoring signal to detect intermittent faults. Repair/replace damaged wiring or connector.
- Inspect camshaft target/reluctor and cam timing: check for missing teeth, debris, damaged reluctor, or timing-chain/belt jump. Verify cam/crank correlation using scan tool or oscilloscope (compare cam and crank waveforms).
- If wiring and sensor check OK and timing is correct, check PCM connector continuity and pin condition. If all circuits test good and symptoms persist, consider PCM diagnosis at specialist shop.
- Replace camshaft position sensor only after confirming wiring and mechanical timing are correct. After repair clear codes and road-test to verify proper operation.
Likely causes
- Broken or chafed harness conductor to cam sensor
- Connector corrosion or pushed-out pin causing intermittent contact
- Short to battery or chassis ground in the sensor signal circuit
- Sensor magnet or reluctor damaged by debris or metal shavings
- Sensor failed electrically (internal open, short or failed electronics)
- Timing chain/belt skipped teeth or variable cam timing actuator failure causing no expected pulse
Fault status
Status
Camshaft Position Sensor A Circuit Bank 1 (signal missing/invalid). Possible open/short/intermittent or sensor/timing problem.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P0340
ISUZU
P — Powertrain
Camshaft Position Sensor Circuit
Views:
UK: 15
EN: 37
RU: 26
AI status
Completed
Completed
100%
Causes
- Failed camshaft position sensor (Hall or VR type)
- Open, shorted or damaged wiring between sensor and PCM
- Corroded, loose or damaged sensor connector or pins
- Faulty power or ground supply to the sensor
- Missing/damaged reluctor/target on camshaft or excessive camshaft wear
- Incorrect cam/crank timing (timing chain/belt jump)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Hard starting, no-start or intermittent no-start
- Rough idle, misfire(s) or engine stumbling
- Loss of power or erratic throttle response
- Poor fuel economy
- Engine stalling at low speeds or immediately after start
What to check
- Scan PCM for P0340 and any related codes; record freeze-frame and live data
- Visual inspection of cam sensor, wiring harness and connector for damage, corrosion, oil intrusion or rodent damage
- Verify sensor retention and correct installation (not loose or contacting moving parts)
- Backprobe sensor connector to check reference voltage, ground and signal with key ON/cranking
- Measure sensor output with oscilloscope while cranking/idle to verify waveform shape and amplitude
- Check continuity and resistance between sensor terminals and PCM connector; inspect for shorts to power/ground
Signal parameters
- Hall-effect type: typically 5 V reference, signal is a digital/square wave toggling ~0–5 V as cam passes target (frequency proportional to engine speed)
- Variable reluctor (VR) type: AC voltage waveform; common idle/crank amplitudes ~0.2–1.5 VAC (varies by design), amplitude and frequency increase with engine speed
- Typical sensor resistance (VR sensors) often in the hundreds to low thousands of ohms — consult OEM spec; Hall sensors show low resistance for power/ground circuits and open circuit on signal when not driven
- Expected behavior: consistent pulses per engine revolution; missing pulses, flatline, or steady voltage indicate fault
Diagnostic algorithm
- Read and record all stored codes and freeze-frame data. Note whether code is current, pending or historical. Clear codes and perform a monitored re-test.
- Perform a thorough visual inspection of the cam sensor, connector and wiring loom for damage, oil ingress, corrosion, broken pins, or connector looseness. Repair as needed.
- With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage (usually ~5 V for Hall types), good ground, and no short to battery. Repair power/ground faults first.
- Crank the engine and observe signal with a digital multimeter (AC volts for VR) or, preferably, an oscilloscope for waveform verification. Look for clean, repeatable pulses. If no signal, suspect open/short or sensor failure.
- If sensor has measurable resistance spec, disconnect and measure sensor coil resistance (VR) or check for internal short/open per OEM spec. Replace if out of range.
- Perform a wiggle test: move wiring and connectors while monitoring signal to detect intermittent faults. Repair/replace damaged wiring or connector.
- Inspect camshaft target/reluctor and cam timing: check for missing teeth, debris, damaged reluctor, or timing-chain/belt jump. Verify cam/crank correlation using scan tool or oscilloscope (compare cam and crank waveforms).
- If wiring and sensor check OK and timing is correct, check PCM connector continuity and pin condition. If all circuits test good and symptoms persist, consider PCM diagnosis at specialist shop.
- Replace camshaft position sensor only after confirming wiring and mechanical timing are correct. After repair clear codes and road-test to verify proper operation.
Likely causes
- Broken or chafed harness conductor to cam sensor
- Connector corrosion or pushed-out pin causing intermittent contact
- Short to battery or chassis ground in the sensor signal circuit
- Sensor magnet or reluctor damaged by debris or metal shavings
- Sensor failed electrically (internal open, short or failed electronics)
- Timing chain/belt skipped teeth or variable cam timing actuator failure causing no expected pulse
Fault status
Status
Camshaft Position Sensor A Circuit Bank 1 (signal missing/invalid). Possible open/short/intermittent or sensor/timing problem.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P0340
LAND ROVER
P — Powertrain
Malfunction of the camshaft position sensor circuit
Views:
UK: 4
EN: 18
RU: 15
AI status
Completed
Completed
100%
Causes
- Failed camshaft position sensor (Hall or VR type)
- Open, shorted or damaged wiring between sensor and PCM
- Corroded, loose or damaged sensor connector or pins
- Faulty power or ground supply to the sensor
- Missing/damaged reluctor/target on camshaft or excessive camshaft wear
- Incorrect cam/crank timing (timing chain/belt jump)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Hard starting, no-start or intermittent no-start
- Rough idle, misfire(s) or engine stumbling
- Loss of power or erratic throttle response
- Poor fuel economy
- Engine stalling at low speeds or immediately after start
What to check
- Scan PCM for P0340 and any related codes; record freeze-frame and live data
- Visual inspection of cam sensor, wiring harness and connector for damage, corrosion, oil intrusion or rodent damage
- Verify sensor retention and correct installation (not loose or contacting moving parts)
- Backprobe sensor connector to check reference voltage, ground and signal with key ON/cranking
- Measure sensor output with oscilloscope while cranking/idle to verify waveform shape and amplitude
- Check continuity and resistance between sensor terminals and PCM connector; inspect for shorts to power/ground
Signal parameters
- Hall-effect type: typically 5 V reference, signal is a digital/square wave toggling ~0–5 V as cam passes target (frequency proportional to engine speed)
- Variable reluctor (VR) type: AC voltage waveform; common idle/crank amplitudes ~0.2–1.5 VAC (varies by design), amplitude and frequency increase with engine speed
- Typical sensor resistance (VR sensors) often in the hundreds to low thousands of ohms — consult OEM spec; Hall sensors show low resistance for power/ground circuits and open circuit on signal when not driven
- Expected behavior: consistent pulses per engine revolution; missing pulses, flatline, or steady voltage indicate fault
Diagnostic algorithm
- Read and record all stored codes and freeze-frame data. Note whether code is current, pending or historical. Clear codes and perform a monitored re-test.
- Perform a thorough visual inspection of the cam sensor, connector and wiring loom for damage, oil ingress, corrosion, broken pins, or connector looseness. Repair as needed.
- With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage (usually ~5 V for Hall types), good ground, and no short to battery. Repair power/ground faults first.
- Crank the engine and observe signal with a digital multimeter (AC volts for VR) or, preferably, an oscilloscope for waveform verification. Look for clean, repeatable pulses. If no signal, suspect open/short or sensor failure.
- If sensor has measurable resistance spec, disconnect and measure sensor coil resistance (VR) or check for internal short/open per OEM spec. Replace if out of range.
- Perform a wiggle test: move wiring and connectors while monitoring signal to detect intermittent faults. Repair/replace damaged wiring or connector.
- Inspect camshaft target/reluctor and cam timing: check for missing teeth, debris, damaged reluctor, or timing-chain/belt jump. Verify cam/crank correlation using scan tool or oscilloscope (compare cam and crank waveforms).
- If wiring and sensor check OK and timing is correct, check PCM connector continuity and pin condition. If all circuits test good and symptoms persist, consider PCM diagnosis at specialist shop.
- Replace camshaft position sensor only after confirming wiring and mechanical timing are correct. After repair clear codes and road-test to verify proper operation.
Likely causes
- Broken or chafed harness conductor to cam sensor
- Connector corrosion or pushed-out pin causing intermittent contact
- Short to battery or chassis ground in the sensor signal circuit
- Sensor magnet or reluctor damaged by debris or metal shavings
- Sensor failed electrically (internal open, short or failed electronics)
- Timing chain/belt skipped teeth or variable cam timing actuator failure causing no expected pulse
Fault status
Status
Camshaft Position Sensor A Circuit Bank 1 (signal missing/invalid). Possible open/short/intermittent or sensor/timing problem.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
P0340
MITSUBISHI
P — Powertrain
Camshaft position sensor
Views:
UK: 9
EN: 28
RU: 20
AI status
Completed
Completed
100%
Causes
- Failed camshaft position sensor (Hall or VR type)
- Open, shorted or damaged wiring between sensor and PCM
- Corroded, loose or damaged sensor connector or pins
- Faulty power or ground supply to the sensor
- Missing/damaged reluctor/target on camshaft or excessive camshaft wear
- Incorrect cam/crank timing (timing chain/belt jump)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Hard starting, no-start or intermittent no-start
- Rough idle, misfire(s) or engine stumbling
- Loss of power or erratic throttle response
- Poor fuel economy
- Engine stalling at low speeds or immediately after start
What to check
- Scan PCM for P0340 and any related codes; record freeze-frame and live data
- Visual inspection of cam sensor, wiring harness and connector for damage, corrosion, oil intrusion or rodent damage
- Verify sensor retention and correct installation (not loose or contacting moving parts)
- Backprobe sensor connector to check reference voltage, ground and signal with key ON/cranking
- Measure sensor output with oscilloscope while cranking/idle to verify waveform shape and amplitude
- Check continuity and resistance between sensor terminals and PCM connector; inspect for shorts to power/ground
Signal parameters
- Hall-effect type: typically 5 V reference, signal is a digital/square wave toggling ~0–5 V as cam passes target (frequency proportional to engine speed)
- Variable reluctor (VR) type: AC voltage waveform; common idle/crank amplitudes ~0.2–1.5 VAC (varies by design), amplitude and frequency increase with engine speed
- Typical sensor resistance (VR sensors) often in the hundreds to low thousands of ohms — consult OEM spec; Hall sensors show low resistance for power/ground circuits and open circuit on signal when not driven
- Expected behavior: consistent pulses per engine revolution; missing pulses, flatline, or steady voltage indicate fault
Diagnostic algorithm
- Read and record all stored codes and freeze-frame data. Note whether code is current, pending or historical. Clear codes and perform a monitored re-test.
- Perform a thorough visual inspection of the cam sensor, connector and wiring loom for damage, oil ingress, corrosion, broken pins, or connector looseness. Repair as needed.
- With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage (usually ~5 V for Hall types), good ground, and no short to battery. Repair power/ground faults first.
- Crank the engine and observe signal with a digital multimeter (AC volts for VR) or, preferably, an oscilloscope for waveform verification. Look for clean, repeatable pulses. If no signal, suspect open/short or sensor failure.
- If sensor has measurable resistance spec, disconnect and measure sensor coil resistance (VR) or check for internal short/open per OEM spec. Replace if out of range.
- Perform a wiggle test: move wiring and connectors while monitoring signal to detect intermittent faults. Repair/replace damaged wiring or connector.
- Inspect camshaft target/reluctor and cam timing: check for missing teeth, debris, damaged reluctor, or timing-chain/belt jump. Verify cam/crank correlation using scan tool or oscilloscope (compare cam and crank waveforms).
- If wiring and sensor check OK and timing is correct, check PCM connector continuity and pin condition. If all circuits test good and symptoms persist, consider PCM diagnosis at specialist shop.
- Replace camshaft position sensor only after confirming wiring and mechanical timing are correct. After repair clear codes and road-test to verify proper operation.
Likely causes
- Broken or chafed harness conductor to cam sensor
- Connector corrosion or pushed-out pin causing intermittent contact
- Short to battery or chassis ground in the sensor signal circuit
- Sensor magnet or reluctor damaged by debris or metal shavings
- Sensor failed electrically (internal open, short or failed electronics)
- Timing chain/belt skipped teeth or variable cam timing actuator failure causing no expected pulse
Fault status
Status
Camshaft Position Sensor A Circuit Bank 1 (signal missing/invalid). Possible open/short/intermittent or sensor/timing problem.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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