Code
P0382
GWM
P — Powertrain
- Malfunction in the exhaust gas recirculation system
AI status
Completed
Completed
100%
Causes
- Stuck, clogged or failed EGR valve or pintle
- Clogged EGR passage or cooler (soot/carbon buildup)
- Faulty EGR position sensor or feedback circuit
- Failed EGR control solenoid (vacuum or electronic)
- Wiring harness damage, poor connector, corrosion or open/short in EGR circuits
- Vacuum supply leak or failed vacuum reservoir (if vacuum‑operated)
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or stalling at idle
- Hesitation, reduced drivability or poor acceleration
- Increased NOx emissions or failed emissions test
- Possible reduced fuel economy
- Black smoke (on some engines) or unusual exhaust behavior
What to check
- Read freeze‑frame and live data with a scan tool; note EGR commanded position vs actual feedback
- Visual inspection of EGR valve, solenoid, wiring harness and connectors for damage or corrosion
- Inspect and test vacuum lines/reservoir (vacuum systems) or wiring/connector continuity (electronic systems)
- Check for soot or carbon blocking EGR passages and cooler
- Command EGR open/close with scanner and observe engine response (idle change, torque reduction)
- Measure voltage/resistance at EGR valve, solenoid and position sensor per manufacturer specs
Signal parameters
- EGR valve position sensor: typically ~0.5–4.5 V across travel (closed→open) — manufacturer values vary
- EGR control solenoid: PWM duty cycle 0–100% when commanded; supply voltage usually battery voltage (approx. 12 V)
- EGR solenoid coil resistance (typical ranges vary): often 2–50 Ω for direct‑drive coils (check OEM spec)
- Vacuum‑operated EGR: vacuum at supply line should reach manifold vacuum or held pressure when commanded
- Current draw when commanded: often 0.1–2 A depending on actuator type (verify with OEM data)
Diagnostic algorithm
- Connect a scan tool, read DTC(s), note freeze frame and live EGR position and commanded values. Record differences.
- Visually inspect EGR valve, actuator, solenoid, vacuum lines and wiring/connectors for damage, disconnection or corrosion.
- With key on/engine off, measure resistance of EGR valve coil and position sensor against OEM resistance specifications.
- Backprobe EGR control and sensor circuits: verify supply voltage (battery), ground continuity and PWM/duty signal while commanding EGR with a scanner.
- For vacuum systems, check vacuum supply and operation of vacuum solenoid using a hand vacuum pump; verify valve movement.
- Command EGR to open/close with a capable scan tool while observing engine response (idle drop/surge) and EGR feedback sensor changes.
- Remove and inspect EGR valve and passages for carbon buildup; clean passages and valve if clogged and retest.
- If actuator and circuits test good but EGR flow still incorrect, inspect EGR cooler, intake/exhaust ports and downstream restrictions; repair or replace components as required.
- Repair or replace faulty components (wiring, solenoid, valve, sensor). Clear codes, perform a relearn if required, and road test to confirm DTC does not return.
- If intermittent or no faults found in EGR system, consider PCM software update or replacement only after verifying all hardware and wiring.
Likely causes
- Carbon buildup restricting EGR valve or passages
- Failed EGR valve (mechanical sticking or electrical failure)
- Defective EGR position sensor or solenoid control
- Wiring/connectors open, shorted, or corroded between ECM and EGR
- Vacuum supply failure (vacuum‑operated systems)
Fault status
Status
EGR system malfunction detected by PCM. MIL illuminated. PCM has stored P0382 indicating EGR response or feedback out of expected range; EGR operation may be reduced or disabled until repair.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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