Code
P0489
Generic
P — Powertrain
EGR A Control Circuit Low
Views:
UK: 15
EN: 28
RU: 16
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the EGR A control circuit
- Corroded, damaged or loose connector at EGR valve/solenoid
- Failed EGR solenoid/valve (internal short or open)
- Blown fuse or poor power/ground supply to EGR circuit
- PCM/ECM driver transistor fault or internal module failure
- Water intrusion or contamination in connector or harness
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Loss of power or hesitation under load
- Increased NOx emissions or failed emissions test
- Possible stalling at low speed or during deceleration
- EGR-related drivability faults when EGR commanded
What to check
- Retrieve freeze frame and freeze data, confirm P0489 is current/not historic
- Scan-tool: confirm EGR A command status, duty cycle or ON/OFF requests
- Visual inspection of EGR valve/solenoid connector, pins and wiring for damage or corrosion
- Check related fuses and relays for EGR circuit power
- Backprobe connector and measure voltage/ground with key ON and while commanding EGR
- Measure coil resistance at the valve/solenoid (compare to spec or typical range)
Signal parameters
- Battery voltage to EGR power feed: approx. 11–14 V with key ON (vehicle-specific)
- Control driver output: expected to switch between near 0 V (grounded) and battery voltage when commanded depending on design; some systems use PWM (0–100% duty)
- Typical solenoid coil resistance: commonly ~20–50 Ω (manufacturer-specific) — consult vehicle spec
- When PCM commands ON (energize) you should see driver behavior: either the PCM pulls the circuit to ground (~0 V) or applies a modulated voltage (PWM). A steady low (
Diagnostic algorithm
- Verify code and capture freeze-frame data with a scan tool; note engine conditions when fault set.
- Visually inspect EGR valve/solenoid connector, pins and harness for corrosion, bent pins, contamination or damage.
- Check relevant fuses, power feed and ground circuits for continuity and correct voltage (battery voltage at supply pin with key ON).
- With connector disconnected, measure coil resistance across solenoid terminals; compare to service spec or typical 20–50 Ω. Very low (near 0 Ω) suggests short; infinite/OL suggests open coil.
- Backprobe the EGR control pin at the harness/connector. With key ON and PCM not commanding, record idle voltage. Command EGR ON with a scan tool and observe voltage/ground behavior. Note whether voltage changes or remains low.
- If voltage remains low when commanded, inspect harness for shorts to ground between PCM and valve; perform continuity checks to ground and to PCM.
- If wiring checks OK and valve coil resistance is within spec, suspect PCM driver fault. Confirm by isolating connector and applying a fused 12 V (or ground, vehicle-specific) to the valve to test operation (only if safe and per manufacturer procedures).
- Repair or replace damaged wiring, connector or EGR valve as indicated. If wiring and valve are good and fault persists, consider PCM testing/replacement following manufacturer diagnostics.
- Clear codes and perform road test under same conditions to confirm repair.
- If fault is intermittent, perform extended monitoring and consider harness repair or protective routing to prevent future failures.
Likely causes
- Disconnected or corroded pin at EGR valve connector
- Broken ground or fused power supply to the EGR coil
- Low coil resistance due to internal short in EGR solenoid
- PCM output stuck low or failed switch driver
- Chafed harness contacting chassis ground causing low-voltage short
Fault status
Status
PCM detected EGR A control circuit voltage lower than expected (control circuit low). Indicates an electrical fault (open/short/low-voltage) in the EGR valve/solenoid control circuit, its power/ground, or PCM driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0489
LAND ROVER
P — Powertrain
Exhaust Gas Recirculation Control - Low Circuit
Views:
UK: 5
EN: 14
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the EGR A control circuit
- Corroded, damaged or loose connector at EGR valve/solenoid
- Failed EGR solenoid/valve (internal short or open)
- Blown fuse or poor power/ground supply to EGR circuit
- PCM/ECM driver transistor fault or internal module failure
- Water intrusion or contamination in connector or harness
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Loss of power or hesitation under load
- Increased NOx emissions or failed emissions test
- Possible stalling at low speed or during deceleration
- EGR-related drivability faults when EGR commanded
What to check
- Retrieve freeze frame and freeze data, confirm P0489 is current/not historic
- Scan-tool: confirm EGR A command status, duty cycle or ON/OFF requests
- Visual inspection of EGR valve/solenoid connector, pins and wiring for damage or corrosion
- Check related fuses and relays for EGR circuit power
- Backprobe connector and measure voltage/ground with key ON and while commanding EGR
- Measure coil resistance at the valve/solenoid (compare to spec or typical range)
Signal parameters
- Battery voltage to EGR power feed: approx. 11–14 V with key ON (vehicle-specific)
- Control driver output: expected to switch between near 0 V (grounded) and battery voltage when commanded depending on design; some systems use PWM (0–100% duty)
- Typical solenoid coil resistance: commonly ~20–50 Ω (manufacturer-specific) — consult vehicle spec
- When PCM commands ON (energize) you should see driver behavior: either the PCM pulls the circuit to ground (~0 V) or applies a modulated voltage (PWM). A steady low (
Diagnostic algorithm
- Verify code and capture freeze-frame data with a scan tool; note engine conditions when fault set.
- Visually inspect EGR valve/solenoid connector, pins and harness for corrosion, bent pins, contamination or damage.
- Check relevant fuses, power feed and ground circuits for continuity and correct voltage (battery voltage at supply pin with key ON).
- With connector disconnected, measure coil resistance across solenoid terminals; compare to service spec or typical 20–50 Ω. Very low (near 0 Ω) suggests short; infinite/OL suggests open coil.
- Backprobe the EGR control pin at the harness/connector. With key ON and PCM not commanding, record idle voltage. Command EGR ON with a scan tool and observe voltage/ground behavior. Note whether voltage changes or remains low.
- If voltage remains low when commanded, inspect harness for shorts to ground between PCM and valve; perform continuity checks to ground and to PCM.
- If wiring checks OK and valve coil resistance is within spec, suspect PCM driver fault. Confirm by isolating connector and applying a fused 12 V (or ground, vehicle-specific) to the valve to test operation (only if safe and per manufacturer procedures).
- Repair or replace damaged wiring, connector or EGR valve as indicated. If wiring and valve are good and fault persists, consider PCM testing/replacement following manufacturer diagnostics.
- Clear codes and perform road test under same conditions to confirm repair.
- If fault is intermittent, perform extended monitoring and consider harness repair or protective routing to prevent future failures.
Likely causes
- Disconnected or corroded pin at EGR valve connector
- Broken ground or fused power supply to the EGR coil
- Low coil resistance due to internal short in EGR solenoid
- PCM output stuck low or failed switch driver
- Chafed harness contacting chassis ground causing low-voltage short
Fault status
Status
PCM detected EGR A control circuit voltage lower than expected (control circuit low). Indicates an electrical fault (open/short/low-voltage) in the EGR valve/solenoid control circuit, its power/ground, or PCM driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 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
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email
