Code
P1795
DAEWOO
P — Powertrain
Ground return circuit abnormal
AI status
Completed
Completed
100%
Causes
- Corroded/loose chassis or module ground connection
- Open or damaged ground wire in wiring harness
- Poor battery negative connection or battery terminal corrosion
- Water intrusion or corrosion in connectors
- Short to power or short-to-ground elsewhere in circuit
- Faulty Transmission Control Module (TCM) or related ECU
Symptoms
- Malfunction Indicator Lamp (MIL) or fault lamp illuminated
- Transmission enters limp/backup mode or shifts poorly
- Erratic shifting, harsh engagement or no engagement
- Possible loss of communication with transmission module
- Stored transmission-related trouble codes
What to check
- Scan for stored and pending codes, view freeze frame and live data
- Visually inspect battery negative, engine block, chassis and TCM ground points for corrosion/looseness
- Inspect wiring harness and connectors for damage, corrosion, or water ingress
- Measure battery voltage with engine off and running
- Perform wiggle test on harness while monitoring fault status
Signal parameters
- Nominal ground potential: ~0.0 V at module ground relative to battery negative
- Recommended ground continuity: less than 1 ohm between module ground and battery negative
- Allowable voltage drop:
- Battery/resting voltage: 12.4–12.8 V (engine off), charging 13.5–14.8 V (engine running)
Diagnostic algorithm
- Read and record all related DTCs and freeze-frame data with a scan tool.
- Verify battery condition and secure battery negative terminal; clean terminals if corroded.
- Visually inspect all ground straps and mounting grounds for looseness or corrosion (engine block, chassis, TCM).
- Unplug TCM connector and inspect pins for corrosion, bent pins, or water. Reconnect securely.
- Measure resistance between TCM ground pin and battery negative: expected
- Measure voltage drop between TCM ground and battery negative while cranking and while monitoring for code set: should be
- If wiring appears damaged, perform continuity and short-to-power checks on the ground conductor; repair splices or replace harness as needed.
- Clear codes and perform a test drive or reproduce conditions to confirm the fault does not return.
- If wiring and grounds are verified good and fault persists, consider module replacement only after confirming power/ground/communication circuits are correct.
Likely causes
- Corroded/loose ground at transmission or TCM mounting point
- Broken ground conductor or chafed harness near transmission or frame
- Battery negative terminal or engine block ground strap corrosion/loose
- Corrosion or water-damaged connector at TCM
- Intermittent internal failure of TCM
Fault status
Status
Ground return circuit abnormal — inspect and repair ground connections, wiring, and connectors to transmission control/related module; replace module only after verifying power and ground integrity.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for DAEWOO
75
Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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- SX, 4D Hatchback, Standard
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- SX, 4D Sedan, Standard
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- SX, 4D Wagon, Standard
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