Code
P1839
DAEWOO
P — Powertrain
Eds 3 drv crct gnd short
AI status
Completed
Completed
100%
Causes
- Wiring shorted to chassis ground (chafed harness, pin contact, damaged insulation)
- Corroded or water‑intruded connector at the actuator or module
- Faulty actuator/solenoid with internal short to ground
- Damaged or shorted driver transistor inside the control module (PCM/TCM/EDS)
- Poor connector pin contact or bent pin making unintended ground connection
- Aftermarket accessories or repairs that altered or damaged the wiring harness
Symptoms
- Malfunction Indicator Lamp (MIL) or warning lamp illuminated
- Associated actuator (EDS channel 3 controlled device) does not operate or operates intermittently
- Erratic operation of the related system (engine/drive/shift symptoms depending on what EDS channel 3 controls)
- Possible limp/limited performance mode if the controller disables the circuit
- Possible blown fuse or unusually warm wiring near the short
What to check
- Read and record freeze frame and all stored codes with a capable scan tool
- Visually inspect wiring harness and connectors for damage, corrosion, signs of heat, or chafing along the route of EDS driver 3
- Disconnect the actuator/solenoid controlled by EDS channel 3 and clear codes; see if code returns (helps distinguish harness/module)
- With ignition off, measure continuity between the driver output pin at the module connector and chassis ground (should show high resistance/open)
- With harness disconnected, measure resistance between the actuator lead and ground to check for internal short
- Perform wiggle test of harness while monitoring live data or resistance to reproduce the fault
Signal parameters
- Normal idle driver output: open/high impedance when off; when commanded ON it should switch toward battery voltage (typically near 12–14 V) or pulse-width modulated depending on function
- With a short to ground: driver output measured at module pin will be near 0 V and may show high current draw
- Typical actuator current (depends on device) may range from
- Resistance of driver output to ground with ignition off and harness disconnected should be very high (kΩ or OL); low ohms indicates short
Diagnostic algorithm
- Connect a scan tool, read P1839 and any related codes; note freeze frame data and conditions when fault occurred.
- Identify the exact circuit: obtain wiring diagram to find the module pin, harness routing, associated actuator/solenoid, power feed and ground points for EDS channel 3.
- Visually inspect harness and connectors at the module, along harness routing, and at the actuator for damage, corrosion, heat, or water ingress. Repair obvious damage and retest.
- With ignition off, disconnect the actuator/solenoid for channel 3. Check continuity between the module driver pin and ground. If continuity remains (low resistance) the short is in the harness or module.
- With actuator disconnected, backprobe module output pin and command the driver ON with scan tool while monitoring voltage/current. If output is pulled to ground, suspect internal module failure; if it switches properly, suspect actuator or harness.
- If short only present with actuator connected, measure resistance of actuator windings to ground and to battery positive to verify internal short. Replace actuator if faulty.
- If harness short is suspected, isolate by disconnecting sections or unplugging connectors sequentially until continuity to ground is removed. Repair wiring (splice, replace section, re‑route and protect) as needed.
- After repair, clear codes and perform functional/repeat tests (cycle the controlled device, road test if applicable) to confirm fault does not return.
- If all external wiring and actuator check good and short remains at module pin, consider module repair or replacement per manufacturer procedures.
- Record repair steps and retest to ensure no additional codes or collateral faults.
Likely causes
- Chafed wiring harness contacting body or engine ground near route for EDS driver 3
- Corroded connector at the actuator or at the module creating a low resistance path to ground
- Failed actuator that shorts to its case/ground when energized
- Internal failure of the module driver transistor resulting in a permanent short to ground
Fault status
Status
Short to ground detected on EDS driver circuit 3. Control module has set fault and illuminated MIL. Inspect harness, connectors, and actuator; if wiring and load check good, suspect internal module driver failure.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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