Code
P0699
Generic
P — Powertrain
Sensor Reference Voltage C Circuit High
Views:
UK: 17
EN: 20
RU: 11
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the Sensor Reference Voltage C wire
- Faulty sensor(s) tied to the Reference C circuit
- Damaged harness (chafing, pinched, exposed conductor) causing a short to Vbatt
- Poor or missing ground(s) or high-resistance ground connection
- Corroded, loose or damaged connector pins at sensor(s) or PCM
- Internal PCM/regulator fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (check engine light)
- Stored or pending P0699 and possibly related sensor codes
- Erratic sensor readings for sensors using Reference C
- Poor idle, hesitation, stalling or reduced drivability if affected sensors are critical
- Multiple sensors on the same reference circuit showing faults simultaneously
What to check
- Retrieve freeze frame data and all stored/pending codes; note related sensor codes
- Visually inspect wiring harness and connectors for the sensors using Reference C
- Identify which sensors share the Reference C circuit from the wiring diagram
- Backprobe the sensor reference pin with key ON, engine OFF and measure voltage to ground
- Disconnect sensors on the Reference C circuit one at a time to see if voltage returns to normal or codes clear
- Inspect for aftermarket devices or repairs that may have tapped into the reference circuit
Signal parameters
- Expected sensor reference voltage: ≈5.0 V (typical 4.5–5.5 V range) with key ON, engine OFF
- Voltage should be stable (low ripple); no large transients or spikes
- When sensors are disconnected, reference should remain within expected range (indicates PCM/regulator is driving it)
Diagnostic algorithm
- Read codes, freeze frame and live data. Note other codes that share the same sensor reference. 2) Obtain wiring diagram to identify all sensors on Reference C and pin locations at sensors and PCM. 3) Visually inspect connectors and wiring for damage, corrosion, chafing, or aftermarket taps. 4) With key ON (engine OFF), backprobe the reference C pin at a sensor connector and measure voltage to ground with a DMM. Compare to expected ~5 V. 5) If voltage is high, disconnect each sensor on the reference C circuit one at a time while monitoring the reference voltage — if disconnecting a particular sensor returns voltage to normal, suspect that sensor or its shorted lead. 6) If disconnecting sensors does not restore normal voltage, test at the PCM reference output pin. If the PCM pin reads high, suspect PCM/regulator fault or a short to battery on the harness between PCM and sensors. 7) Perform wiggle tests and flex harness while monitoring voltage to reproduce intermittent shorts. 8) If wiring is faulty, repair or replace affected sections and re-test. 9) If wiring and sensors check good and PCM output remains out of range, consider PCM replacement only after confirmation with bench test or manufacturer guidance. 10) Clear codes and test drive to confirm repair. Use an oscilloscope if transient or ripple issues are suspected.
Likely causes
- Short to battery on reference C wiring (most common)
- Corroded/loose connector at a sensor on reference C
- Faulty sensor connected to reference C
- Harness damage where it contacts chassis or hot circuits
- PCM output/regulator failure (less common)
Fault status
Status
PCM reports Sensor Reference Voltage C circuit is higher than expected. Check wiring/connectors, sensors on that reference circuit, and PCM reference output.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0699
LAND ROVER
P — Powertrain
Reference voltage sensor C - high circuit
Views:
UK: 2
EN: 6
RU: 4
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the Sensor Reference Voltage C wire
- Faulty sensor(s) tied to the Reference C circuit
- Damaged harness (chafing, pinched, exposed conductor) causing a short to Vbatt
- Poor or missing ground(s) or high-resistance ground connection
- Corroded, loose or damaged connector pins at sensor(s) or PCM
- Internal PCM/regulator fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (check engine light)
- Stored or pending P0699 and possibly related sensor codes
- Erratic sensor readings for sensors using Reference C
- Poor idle, hesitation, stalling or reduced drivability if affected sensors are critical
- Multiple sensors on the same reference circuit showing faults simultaneously
What to check
- Retrieve freeze frame data and all stored/pending codes; note related sensor codes
- Visually inspect wiring harness and connectors for the sensors using Reference C
- Identify which sensors share the Reference C circuit from the wiring diagram
- Backprobe the sensor reference pin with key ON, engine OFF and measure voltage to ground
- Disconnect sensors on the Reference C circuit one at a time to see if voltage returns to normal or codes clear
- Inspect for aftermarket devices or repairs that may have tapped into the reference circuit
Signal parameters
- Expected sensor reference voltage: ≈5.0 V (typical 4.5–5.5 V range) with key ON, engine OFF
- Voltage should be stable (low ripple); no large transients or spikes
- When sensors are disconnected, reference should remain within expected range (indicates PCM/regulator is driving it)
Diagnostic algorithm
- Read codes, freeze frame and live data. Note other codes that share the same sensor reference. 2) Obtain wiring diagram to identify all sensors on Reference C and pin locations at sensors and PCM. 3) Visually inspect connectors and wiring for damage, corrosion, chafing, or aftermarket taps. 4) With key ON (engine OFF), backprobe the reference C pin at a sensor connector and measure voltage to ground with a DMM. Compare to expected ~5 V. 5) If voltage is high, disconnect each sensor on the reference C circuit one at a time while monitoring the reference voltage — if disconnecting a particular sensor returns voltage to normal, suspect that sensor or its shorted lead. 6) If disconnecting sensors does not restore normal voltage, test at the PCM reference output pin. If the PCM pin reads high, suspect PCM/regulator fault or a short to battery on the harness between PCM and sensors. 7) Perform wiggle tests and flex harness while monitoring voltage to reproduce intermittent shorts. 8) If wiring is faulty, repair or replace affected sections and re-test. 9) If wiring and sensors check good and PCM output remains out of range, consider PCM replacement only after confirmation with bench test or manufacturer guidance. 10) Clear codes and test drive to confirm repair. Use an oscilloscope if transient or ripple issues are suspected.
Likely causes
- Short to battery on reference C wiring (most common)
- Corroded/loose connector at a sensor on reference C
- Faulty sensor connected to reference C
- Harness damage where it contacts chassis or hot circuits
- PCM output/regulator failure (less common)
Fault status
Status
PCM reports Sensor Reference Voltage C circuit is higher than expected. Check wiring/connectors, sensors on that reference circuit, and PCM reference output.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Was this AI description helpful?
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