P1133

Code

DAEWOO P — Powertrain

AT FUEL SOLENOID MAL

Brand: DAEWOO

Type: P — Powertrain

Views: UK: 1 EN: 4 RU: 3

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Page language: EN

Causes

Faulty transmission solenoid (internal electrical failure or stuck plunger)
Open or shorted wiring in the solenoid harness
Poor or corroded connector pins or terminal contact at the solenoid or TCM
Low or intermittent supply voltage (battery, fuse, ignition feed)
Faulty transmission control module (TCM) or ground
Contaminated or degraded transmission fluid causing solenoid sticking

Symptoms

Check Engine/Transmission fault lamp illuminated
Harsh, delayed, erratic or missed shifts
Transmission may default to limp/failsafe mode (reduced gear availability)
Unusual transmission noises or slipping under load
Possible inability to select certain gears or loss of drive

What to check

Retrieve freeze frame and all stored transmission codes with a scan tool; note conditions when fault set
Visually inspect solenoid connector and wiring for damage, corrosion, or poor mating
Check TCM/ECU grounds and power supply fuses related to transmission circuits
Check transmission fluid level and condition (burnt smell, debris)
Backprobe solenoid connector and monitor voltage with ignition ON and while commanding solenoid via scan tool (if supported)
Measure solenoid coil resistance and compare to specification or expected range

Signal parameters

Solenoid DC coil resistance: typically in the low tens of ohms (commonly ~10–50 Ω) — consult vehicle-specific spec
Supply voltage at solenoid connector with ignition ON: battery voltage (~11–14 V) on feed circuit
Control signal: pulsed/ground-switched by TCM; duty cycle or frequency varies with strategy (PWM at tens to hundreds of Hz)
Open-circuit: infinite resistance; short-to-ground/short-to-power will show very low resistance

Diagnostic algorithm

Read and record all DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm repeatability.
Perform visual inspection of solenoid connector and wiring. Repair any damaged insulation, pins, or connectors.
Check transmission fluid level/condition; change or filter if severely contaminated.
With ignition ON (engine off), backprobe the solenoid connector. Verify reference/feed voltage and ground control presence. Use a DVOM to measure DC voltage; use an oscilloscope if available to observe PWM control.
Measure solenoid coil resistance at the connector (unplugged or with pins isolated). Compare to spec or typical range. Replace solenoid if out of range or open/shorted.
If wiring and solenoid resistance are OK, command the solenoid ON/OFF with a capable scan tool while monitoring voltage and current. Observe for proper switching and response (and listen/feel for actuation if accessible).
Perform continuity/resistance checks from solenoid connector to TCM pins to rule out harness faults. Repair any opens/shorts; secure grounds.
If wiring and solenoid test good but fault persists, consider TCM fault — perform TCM power/ground checks and consult manufacturer procedures for TCM testing or replacement.
After repairs, clear codes and perform road test under conditions similar to when code was set to verify repair.
If intermittent, use data logging to capture operation over time; inspect for heat-related or vibration-related failures.

Likely causes

Corroded or loose connector at the solenoid
Open or shorted wire in harness to the TCM
Failed solenoid coil (electrical short or open)
Fluid contamination causing solenoid sticking

Fault status

⚠️ Status

P1133 - AT Fuel Solenoid Malfunction (Daewoo): Transmission solenoid circuit fault detected. Inspect solenoid, wiring/connectors, transmission fluid, and TCM.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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P1133 — AT FUEL SOLENOID MAL