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P0401 OBD2 Code on 2001 Chrysler Sebring 3.0L with 3.0L Engine - EGR System Diagnosis & TSB Reference

Model: 2001 Chrysler Sebring Fault Code: P0401 Posted: 2016-11-11 11:27

The P0401 diagnostic trouble code persists despite comprehensive testing of the EGR system. Key findings: 1) EGR solenoid resistance measured at 35.1 ohms — within acceptable range (29–35 ohms). 2) Plug voltage readings: 0.02 VDC at the solenoid terminal and 0.10 VDC when harness plug is disconnected, indicating minimal signal delivery. 3) Vacuum test: Applied 10" of vacuum to the yellow tube; solenoid charged successfully and maintained pressure. 4) When the white vacuum line was removed and replaced with a gauge, engine started and showed 7" of vacuum at the EGR port — within the acceptable range (6–7"). 5) The EGR solenoid was recently replaced (within the past year), ruling out mechanical failure as the root cause. Despite these results, the P0401 code remains active. Given that no other engine-related codes are present and EGR activation via scanner is not possible, we suspect potential issues in the EGR command signal path or sensor inputs. Questions for community: - Is this a 2001 Chrysler Sebring with a 3.0L engine (Mitsubishi-sourced powertrain)? - Has any TSB been referenced? Specifically, TSB 18-33-98 related to EGR system malfunctions? - Are there any known wiring or pin-out issues for the EGR solenoid control circuit? - Could a sensor such as ECT (Engine Coolant Temperature) or MAP (Manifold Absolute Pressure) be interfering with EGR operation? Any additional diagnostics, troubleshooting steps, or known fixes for this specific model and code combination?

Related fault codes
P0401
Comments (6)
Anonymous 2016-11-11 13:30

This appears to be a 4-door Chrysler Sebring with the 3.0L engine — could you confirm that? Are there any additional diagnostic codes present (e.g., ECT, MAP)? When using a scanner, does the EGR valve close under command? If so, does the engine run roughly or stall during operation? Also, have you reviewed TSB 18-33-98 for known EGR-related issues in this model year and engine?

Anonymous 2016-11-12 10:24

Corrected: This is a 2001 model. It has the 3.0L engine with Mitsubishi-sourced powertrain. We were unable to activate the EGR valve using a Modis Edge scanner, but successfully closed it by applying direct current via a PP4 tester. As a result, we have opted to warranty the DPFE sensor and are awaiting confirmation whether this resolves the P0401 code.

Anonymous 2016-11-12 10:46

Model year and body style matter — is it a 2000 or 2001? Is it a 4-door Chrysler Sebring, or a 2-door with Mitsubishi powertrain (which may have different EGR configurations)? Are there any other diagnostic trouble codes present that might interfere with EGR operation?

Anonymous 2016-11-14 09:48

Confirmed: This is a 2001 Chrysler Sebring equipped with the 3.0L engine and Mitsubishi-sourced powertrain. The vehicle has returned with the same P0401 code persisting after all tests.

Anonymous 2016-11-14 13:38

The scanner fails to command EGR valve closure — this suggests a potential issue in the wiring harness or pin-out configuration. I’ve also asked whether any other codes (e.g., ECT, MAP) exist that might prevent EGR operation. Notably, there is no EGR command signal at idle, which may indicate an involvement of the TPS (Throttle Position Sensor). Could this be a contributing factor?

Anonymous 2016-11-14 13:54

No additional diagnostic codes are currently present. We will reinspect wiring connections, harness integrity, and EGR valve circuitry once the vehicle is back in the shop. Will update with further findings.