Code
P1403
CHRYSLER
P — Powertrain
Exhaust Gas Recirculation System Valve 1
AI status
Completed
Completed
100%
Causes
- Failed or sticking EGR valve (mechanical or carbon buildup)
- Faulty EGR valve position sensor or integrated solenoid
- Open, shorted, or corroded wiring or connector to the EGR valve
- Failed EGR vacuum solenoid (vacuum systems) or electronic actuator
- Weak or missing ground or supply voltage to the EGR circuit
- PCM or module internal fault (less common)
Symptoms
- Check Engine MIL illuminated
- Rough idle, hesitation or poor low-speed drivability
- Reduced engine performance or stalling at low RPM
- Increased NOx emissions; possible failed emissions test
- Possible engine ping/detonation under light load (if EGR stuck closed)
What to check
- Read freeze-frame and live data with a scan tool (EGR commanded position, actual position/feedback, duty cycle, voltages)
- Check for additional DTCs (related emissions, sensors, grounds)
- Visually inspect EGR valve, vacuum lines (if applicable), connectors and wiring for damage or corrosion
- Backprobe connector and measure supply voltage and ground with key on
- Check for carbon buildup in EGR valve/ports and for free movement of the valve
- Perform continuity and resistance checks on harness between PCM and EGR valve
Signal parameters
- EGR command: PCM output typically PWM duty cycle 0–100% (varies by model)
- EGR position feedback: typical sensor range ~0.5–4.5 V (model dependent)
- Supply voltage to EGR actuator: near battery voltage (approx. 11–14 V) with key on
- Coil/solenoid resistance: typically a low-ohm value (varies by design) — compare to service data
- Expected response: commanded changes should produce rapid change in feedback/engine behavior (vacuum or position) when commanded
Diagnostic algorithm
- Verify the code with a scan tool, record freeze-frame and live data for EGR command vs feedback, then clear codes and attempt to reproduce the fault.
- Inspect EGR valve and related vacuum lines (if applicable) for carbon buildup, sticking, broken lines or seized linkages; clean or remove carbon as needed.
- Visually inspect harness and connector for corrosion, bent pins, damage or poor seating. Repair or replace damaged connectors/wiring.
- Backprobe the EGR connector: verify ignition-switched supply voltage, control signal (PWM/voltage) from PCM and a good ground while commanding EGR ON/OFF from the scan tool.
- Measure resistance and continuity of the actuator/solenoid coil and wiring to the PCM; compare to factory values. Check for shorts to power or ground.
- For vacuum-operated valves: apply hand-held vacuum to the EGR valve while monitoring engine response (idle change) to confirm valve operation.
- If actuator does not respond electrically but wiring is good, bench-test or replace the EGR valve/solenoid assembly.
- If wiring and EGR assembly test good, inspect PCM connector and grounds. Consider PCM bench testing or reprogramming only after ruling out external causes.
- After repair or replacement, clear codes, re-run readiness/drive cycle and confirm code does not return.
Likely causes
- Carbon-clogged or stuck EGR valve preventing commanded movement
- Damaged wiring harness/poor connector connection at EGR valve
- Faulty EGR solenoid/actuator not responding to PCM commands
- Loss of supply voltage or ground for EGR circuit
Fault status
Status
P1403 — Exhaust Gas Recirculation System Valve 1: EGR valve or control circuit fault detected (actuator/feedback or wiring issue).
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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