Code
P1230
DAEWOO
P — Powertrain
FUEL PUMP RELAY FLT(OPEN/GND)
Views:
UK: 24
EN: 94
RU: 37
AI status
Completed
Completed
100%
Causes
- Blown fuse for fuel pump circuit
- Faulty fuel pump relay (contacts or coil)
- Open wiring or connector (broken wire, corrosion, pin pushed out) in relay control or pump supply circuit
- Short to ground on the relay control feed from the ECM
- Poor or missing ground at relay or pump
- Failed fuel pump or pump module causing abnormal load/feedback
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P1230 stored
- Engine cranks but will not start (no fuel delivery)
- Intermittent no-start or stalling while driving
- No audible fuel pump prime when ignition is turned on
- Low or no fuel rail pressure on test
What to check
- Scan for P1230 and any related codes; record freeze-frame and readiness status
- Listen for fuel pump prime when ignition ON (key to ON, do not crank)
- Visually inspect fuse(s), relay, relay socket, wiring harness and connectors for damage or corrosion
- Check fuel pump fuse continuity and fuse voltage with key ON
- Backprobe relay socket while commanding fuel pump (with scan tool or crank) to verify control voltage/ground and battery voltage to pump feed
- Measure coil resistance of suspect relay and compare to specification or swap with identical known-good relay
Signal parameters
- Battery voltage at relay power terminal with ignition ON or when commanded: ~11–14.5 V
- Control/drive terminal when ECM commands relay: either near battery voltage (switched power style) or pulled to ground (switch-to-ground style) — should change state when commanded
- Relay coil resistance (typical range): ~50–200 Ω (varies by relay) — open coil = OL
- Open-circuit indication: very high resistance / OL between relay coil and expected circuit path
- Short-to-ground indication: very low resistance (
Diagnostic algorithm
- Record freeze-frame and note conditions when code set; verify battery is charged
- Visually inspect fuse(s), relay, relay socket and wiring for obvious damage or corrosion; repair as needed
- Confirm fuel pump operation: with ignition ON listen for prime; if silent, check pump fuse and relay power terminal for battery voltage
- Backprobe relay connector with connector in place and command fuel pump using scan tool or crank engine; verify: battery feed present at supply pin, control pin changes state when commanded, and ground continuity is present
- If control pin is not changing when commanded, test relay by swapping with identical known-good relay; if pump runs, replace relay
- If swapping relay does not help, measure continuity between ECM driver pin and relay connector for opens/shorts; repair broken wires or damaged connectors
- If control wire is shorted to ground, isolate and repair wiring harness damage before replacing ECM
- If wiring and relay test OK but pump still will not run, bench-test or apply regulated 12V directly to pump (follow safety procedures: relieve fuel pressure, work in ventilated area) to verify pump function, then replace pump or module if faulty
- After repairs, clear codes, perform functional test and verify fuel pressure and that P1230 does not return
Likely causes
- Faulty or corroded connector at fuel pump relay or fuse (very common)
- Blown fuse or failed relay
- Open/broken wire between ECM and relay socket
- Short to ground in relay control circuit
- Faulty relay coil or contacts
Fault status
Status
Fuel pump relay circuit fault detected (open or grounded). ECM reports abnormal relay control/supply; fuel pump may not be energized.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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