Code
P0520
Generic
P — Powertrain
Engine Oil Pressure Sensor/Switch A Circuit
Views:
UK: 28
EN: 49
RU: 45
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the oil pressure sensor and PCM
- Corroded, loose, or damaged sensor connector pins
- Failed oil pressure sensor or switch
- Poor sensor ground or reference voltage (blown fuse, bad ground, low battery voltage)
- Intermittent connection (broken wire, damaged insulation)
- PCM input circuit fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Oil pressure warning light or message (may be separate) or erroneous oil pressure gauge reading
- Incorrect or fluctuating oil pressure readings on scan tool
- Possible drivability concerns if vehicle enters limp mode (manufacturer dependent)
- Engine may run normally but with risk of undetected low oil pressure
What to check
- Verify engine oil level and condition (do not assume electrical fault if oil is very low)
- Scan for stored and pending codes and note freeze-frame data
- Visual inspection of oil pressure sensor, connector, and wiring for damage, corrosion, or oil intrusion
- Check for blown fuses and battery/system voltage stability
- Backprobe sensor connector to measure reference voltage, signal voltage, and ground
- Compare electronic oil pressure reading to a mechanical gauge to rule out mechanical pressure issues
Signal parameters
- Typical sensor types: variable voltage pressure sensor (analog) or pressure-switch (open/closed).
- Common analog range: ~0.5–4.5 V (0 psi to high pressure) with a 5 V reference from PCM (varies by manufacturer).
- Switch type: continuity to ground or to battery voltage when pressure crosses threshold.
- At key ON/engine OFF the signal may read near a predefined voltage (varies by design); on running engine signal should change with rpm/pressure.
- Reference circuit: 5 V supply (check for ~5 V at reference pin). Ground circuit: near 0 Ω to chassis.
Diagnostic algorithm
- Safety first: Park on level surface, set parking brake, engine off and cool. Use PPE and secure vehicle.
- Retrieve DTCs and freeze-frame data with a scan tool. Note when fault set (idle, start, warm, cold).
- Visually inspect sensor and harness for oil contamination, corrosion, broken wires, or connector damage. Repair obvious damage.
- Check engine oil level and top to correct level if low; re-check for codes after driving if oil was low.
- With ignition ON (engine OFF), backprobe sensor connector: verify 5 V reference (if used) and good ground. If no reference, trace/fuse to PCM.
- Start engine and observe signal voltage while increasing RPM. Signal should change smoothly with rpm/pressure. Look for open circuit (no change) or stuck/erratic readings.
- Wiggle test wiring and connectors while monitoring signal for intermittent behavior. Repair any intermittent wiring faults.
- Measure resistance/continuity between sensor ground and chassis ground; repair poor grounds.
- If the harness and power/ground are good, compare electronic reading to a mechanical oil pressure gauge to exclude internal engine oil pressure problems.
- If sensor wiring checks good and mechanical pressure is normal, replace the oil pressure sensor/switch. Clear codes and road test to confirm repair.
- If code returns after replacing sensor and repairing harness, check PCM input circuits and grounds. Consider PCM diagnostics or replacement only after exhaustive wiring/sensor verification.
Likely causes
- Faulty oil pressure sensor/switch
- Corroded/loose connector at the sensor
- Broken or shorted harness (chafing, pinched, rodent damage)
- Bad ground or missing 5V reference from PCM
- Blown fuse or low system voltage affecting sensor circuit
Fault status
Status
P0520 - Engine Oil Pressure Sensor/Switch A Circuit. MIL ON. Circuit open/short/intermittent detected in oil pressure sensor input.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P0520
GWM
P — Powertrain
- Oil pressure sensor circuit fault
Views:
UK: 12
EN: 21
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the oil pressure sensor and PCM
- Corroded, loose, or damaged sensor connector pins
- Failed oil pressure sensor or switch
- Poor sensor ground or reference voltage (blown fuse, bad ground, low battery voltage)
- Intermittent connection (broken wire, damaged insulation)
- PCM input circuit fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Oil pressure warning light or message (may be separate) or erroneous oil pressure gauge reading
- Incorrect or fluctuating oil pressure readings on scan tool
- Possible drivability concerns if vehicle enters limp mode (manufacturer dependent)
- Engine may run normally but with risk of undetected low oil pressure
What to check
- Verify engine oil level and condition (do not assume electrical fault if oil is very low)
- Scan for stored and pending codes and note freeze-frame data
- Visual inspection of oil pressure sensor, connector, and wiring for damage, corrosion, or oil intrusion
- Check for blown fuses and battery/system voltage stability
- Backprobe sensor connector to measure reference voltage, signal voltage, and ground
- Compare electronic oil pressure reading to a mechanical gauge to rule out mechanical pressure issues
Signal parameters
- Typical sensor types: variable voltage pressure sensor (analog) or pressure-switch (open/closed).
- Common analog range: ~0.5–4.5 V (0 psi to high pressure) with a 5 V reference from PCM (varies by manufacturer).
- Switch type: continuity to ground or to battery voltage when pressure crosses threshold.
- At key ON/engine OFF the signal may read near a predefined voltage (varies by design); on running engine signal should change with rpm/pressure.
- Reference circuit: 5 V supply (check for ~5 V at reference pin). Ground circuit: near 0 Ω to chassis.
Diagnostic algorithm
- Safety first: Park on level surface, set parking brake, engine off and cool. Use PPE and secure vehicle.
- Retrieve DTCs and freeze-frame data with a scan tool. Note when fault set (idle, start, warm, cold).
- Visually inspect sensor and harness for oil contamination, corrosion, broken wires, or connector damage. Repair obvious damage.
- Check engine oil level and top to correct level if low; re-check for codes after driving if oil was low.
- With ignition ON (engine OFF), backprobe sensor connector: verify 5 V reference (if used) and good ground. If no reference, trace/fuse to PCM.
- Start engine and observe signal voltage while increasing RPM. Signal should change smoothly with rpm/pressure. Look for open circuit (no change) or stuck/erratic readings.
- Wiggle test wiring and connectors while monitoring signal for intermittent behavior. Repair any intermittent wiring faults.
- Measure resistance/continuity between sensor ground and chassis ground; repair poor grounds.
- If the harness and power/ground are good, compare electronic reading to a mechanical oil pressure gauge to exclude internal engine oil pressure problems.
- If sensor wiring checks good and mechanical pressure is normal, replace the oil pressure sensor/switch. Clear codes and road test to confirm repair.
- If code returns after replacing sensor and repairing harness, check PCM input circuits and grounds. Consider PCM diagnostics or replacement only after exhaustive wiring/sensor verification.
Likely causes
- Faulty oil pressure sensor/switch
- Corroded/loose connector at the sensor
- Broken or shorted harness (chafing, pinched, rodent damage)
- Bad ground or missing 5V reference from PCM
- Blown fuse or low system voltage affecting sensor circuit
Fault status
Status
P0520 - Engine Oil Pressure Sensor/Switch A Circuit. MIL ON. Circuit open/short/intermittent detected in oil pressure sensor input.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P0520
HUMMER
P — Powertrain
Engine Oil Pressure Sensor/Switch Circuit Malfunction
Views:
UK: 17
EN: 39
RU: 31
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the oil pressure sensor and PCM
- Corroded, loose, or damaged sensor connector pins
- Failed oil pressure sensor or switch
- Poor sensor ground or reference voltage (blown fuse, bad ground, low battery voltage)
- Intermittent connection (broken wire, damaged insulation)
- PCM input circuit fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Oil pressure warning light or message (may be separate) or erroneous oil pressure gauge reading
- Incorrect or fluctuating oil pressure readings on scan tool
- Possible drivability concerns if vehicle enters limp mode (manufacturer dependent)
- Engine may run normally but with risk of undetected low oil pressure
What to check
- Verify engine oil level and condition (do not assume electrical fault if oil is very low)
- Scan for stored and pending codes and note freeze-frame data
- Visual inspection of oil pressure sensor, connector, and wiring for damage, corrosion, or oil intrusion
- Check for blown fuses and battery/system voltage stability
- Backprobe sensor connector to measure reference voltage, signal voltage, and ground
- Compare electronic oil pressure reading to a mechanical gauge to rule out mechanical pressure issues
Signal parameters
- Typical sensor types: variable voltage pressure sensor (analog) or pressure-switch (open/closed).
- Common analog range: ~0.5–4.5 V (0 psi to high pressure) with a 5 V reference from PCM (varies by manufacturer).
- Switch type: continuity to ground or to battery voltage when pressure crosses threshold.
- At key ON/engine OFF the signal may read near a predefined voltage (varies by design); on running engine signal should change with rpm/pressure.
- Reference circuit: 5 V supply (check for ~5 V at reference pin). Ground circuit: near 0 Ω to chassis.
Diagnostic algorithm
- Safety first: Park on level surface, set parking brake, engine off and cool. Use PPE and secure vehicle.
- Retrieve DTCs and freeze-frame data with a scan tool. Note when fault set (idle, start, warm, cold).
- Visually inspect sensor and harness for oil contamination, corrosion, broken wires, or connector damage. Repair obvious damage.
- Check engine oil level and top to correct level if low; re-check for codes after driving if oil was low.
- With ignition ON (engine OFF), backprobe sensor connector: verify 5 V reference (if used) and good ground. If no reference, trace/fuse to PCM.
- Start engine and observe signal voltage while increasing RPM. Signal should change smoothly with rpm/pressure. Look for open circuit (no change) or stuck/erratic readings.
- Wiggle test wiring and connectors while monitoring signal for intermittent behavior. Repair any intermittent wiring faults.
- Measure resistance/continuity between sensor ground and chassis ground; repair poor grounds.
- If the harness and power/ground are good, compare electronic reading to a mechanical oil pressure gauge to exclude internal engine oil pressure problems.
- If sensor wiring checks good and mechanical pressure is normal, replace the oil pressure sensor/switch. Clear codes and road test to confirm repair.
- If code returns after replacing sensor and repairing harness, check PCM input circuits and grounds. Consider PCM diagnostics or replacement only after exhaustive wiring/sensor verification.
Likely causes
- Faulty oil pressure sensor/switch
- Corroded/loose connector at the sensor
- Broken or shorted harness (chafing, pinched, rodent damage)
- Bad ground or missing 5V reference from PCM
- Blown fuse or low system voltage affecting sensor circuit
Fault status
Status
P0520 - Engine Oil Pressure Sensor/Switch A Circuit. MIL ON. Circuit open/short/intermittent detected in oil pressure sensor input.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P0520
LAND ROVER
P — Powertrain
Engine oil pressure sensor / circuit malfunction switch
Views:
UK: 12
EN: 26
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the oil pressure sensor and PCM
- Corroded, loose, or damaged sensor connector pins
- Failed oil pressure sensor or switch
- Poor sensor ground or reference voltage (blown fuse, bad ground, low battery voltage)
- Intermittent connection (broken wire, damaged insulation)
- PCM input circuit fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Oil pressure warning light or message (may be separate) or erroneous oil pressure gauge reading
- Incorrect or fluctuating oil pressure readings on scan tool
- Possible drivability concerns if vehicle enters limp mode (manufacturer dependent)
- Engine may run normally but with risk of undetected low oil pressure
What to check
- Verify engine oil level and condition (do not assume electrical fault if oil is very low)
- Scan for stored and pending codes and note freeze-frame data
- Visual inspection of oil pressure sensor, connector, and wiring for damage, corrosion, or oil intrusion
- Check for blown fuses and battery/system voltage stability
- Backprobe sensor connector to measure reference voltage, signal voltage, and ground
- Compare electronic oil pressure reading to a mechanical gauge to rule out mechanical pressure issues
Signal parameters
- Typical sensor types: variable voltage pressure sensor (analog) or pressure-switch (open/closed).
- Common analog range: ~0.5–4.5 V (0 psi to high pressure) with a 5 V reference from PCM (varies by manufacturer).
- Switch type: continuity to ground or to battery voltage when pressure crosses threshold.
- At key ON/engine OFF the signal may read near a predefined voltage (varies by design); on running engine signal should change with rpm/pressure.
- Reference circuit: 5 V supply (check for ~5 V at reference pin). Ground circuit: near 0 Ω to chassis.
Diagnostic algorithm
- Safety first: Park on level surface, set parking brake, engine off and cool. Use PPE and secure vehicle.
- Retrieve DTCs and freeze-frame data with a scan tool. Note when fault set (idle, start, warm, cold).
- Visually inspect sensor and harness for oil contamination, corrosion, broken wires, or connector damage. Repair obvious damage.
- Check engine oil level and top to correct level if low; re-check for codes after driving if oil was low.
- With ignition ON (engine OFF), backprobe sensor connector: verify 5 V reference (if used) and good ground. If no reference, trace/fuse to PCM.
- Start engine and observe signal voltage while increasing RPM. Signal should change smoothly with rpm/pressure. Look for open circuit (no change) or stuck/erratic readings.
- Wiggle test wiring and connectors while monitoring signal for intermittent behavior. Repair any intermittent wiring faults.
- Measure resistance/continuity between sensor ground and chassis ground; repair poor grounds.
- If the harness and power/ground are good, compare electronic reading to a mechanical oil pressure gauge to exclude internal engine oil pressure problems.
- If sensor wiring checks good and mechanical pressure is normal, replace the oil pressure sensor/switch. Clear codes and road test to confirm repair.
- If code returns after replacing sensor and repairing harness, check PCM input circuits and grounds. Consider PCM diagnostics or replacement only after exhaustive wiring/sensor verification.
Likely causes
- Faulty oil pressure sensor/switch
- Corroded/loose connector at the sensor
- Broken or shorted harness (chafing, pinched, rodent damage)
- Bad ground or missing 5V reference from PCM
- Blown fuse or low system voltage affecting sensor circuit
Fault status
Status
P0520 - Engine Oil Pressure Sensor/Switch A Circuit. MIL ON. Circuit open/short/intermittent detected in oil pressure sensor input.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P0520
MERCEDES-BENZ
P — Powertrain
Engine Oil Pressure Sensor/Switch Circuit Malfunction
Views:
UK: 19
EN: 37
RU: 32
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the oil pressure sensor and PCM
- Corroded, loose, or damaged sensor connector pins
- Failed oil pressure sensor or switch
- Poor sensor ground or reference voltage (blown fuse, bad ground, low battery voltage)
- Intermittent connection (broken wire, damaged insulation)
- PCM input circuit fault (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Oil pressure warning light or message (may be separate) or erroneous oil pressure gauge reading
- Incorrect or fluctuating oil pressure readings on scan tool
- Possible drivability concerns if vehicle enters limp mode (manufacturer dependent)
- Engine may run normally but with risk of undetected low oil pressure
What to check
- Verify engine oil level and condition (do not assume electrical fault if oil is very low)
- Scan for stored and pending codes and note freeze-frame data
- Visual inspection of oil pressure sensor, connector, and wiring for damage, corrosion, or oil intrusion
- Check for blown fuses and battery/system voltage stability
- Backprobe sensor connector to measure reference voltage, signal voltage, and ground
- Compare electronic oil pressure reading to a mechanical gauge to rule out mechanical pressure issues
Signal parameters
- Typical sensor types: variable voltage pressure sensor (analog) or pressure-switch (open/closed).
- Common analog range: ~0.5–4.5 V (0 psi to high pressure) with a 5 V reference from PCM (varies by manufacturer).
- Switch type: continuity to ground or to battery voltage when pressure crosses threshold.
- At key ON/engine OFF the signal may read near a predefined voltage (varies by design); on running engine signal should change with rpm/pressure.
- Reference circuit: 5 V supply (check for ~5 V at reference pin). Ground circuit: near 0 Ω to chassis.
Diagnostic algorithm
- Safety first: Park on level surface, set parking brake, engine off and cool. Use PPE and secure vehicle.
- Retrieve DTCs and freeze-frame data with a scan tool. Note when fault set (idle, start, warm, cold).
- Visually inspect sensor and harness for oil contamination, corrosion, broken wires, or connector damage. Repair obvious damage.
- Check engine oil level and top to correct level if low; re-check for codes after driving if oil was low.
- With ignition ON (engine OFF), backprobe sensor connector: verify 5 V reference (if used) and good ground. If no reference, trace/fuse to PCM.
- Start engine and observe signal voltage while increasing RPM. Signal should change smoothly with rpm/pressure. Look for open circuit (no change) or stuck/erratic readings.
- Wiggle test wiring and connectors while monitoring signal for intermittent behavior. Repair any intermittent wiring faults.
- Measure resistance/continuity between sensor ground and chassis ground; repair poor grounds.
- If the harness and power/ground are good, compare electronic reading to a mechanical oil pressure gauge to exclude internal engine oil pressure problems.
- If sensor wiring checks good and mechanical pressure is normal, replace the oil pressure sensor/switch. Clear codes and road test to confirm repair.
- If code returns after replacing sensor and repairing harness, check PCM input circuits and grounds. Consider PCM diagnostics or replacement only after exhaustive wiring/sensor verification.
Likely causes
- Faulty oil pressure sensor/switch
- Corroded/loose connector at the sensor
- Broken or shorted harness (chafing, pinched, rodent damage)
- Bad ground or missing 5V reference from PCM
- Blown fuse or low system voltage affecting sensor circuit
Fault status
Status
P0520 - Engine Oil Pressure Sensor/Switch A Circuit. MIL ON. Circuit open/short/intermittent detected in oil pressure sensor input.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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