REM Codes Description

Got that pesky yellow Check Engine Light on your REM? Fear not, for now you have the power to vanquish those stubborn Renix Electrical Gremlins once and for all!

REM Codes

  • MAP Sensor Low:
    Manifold Air Pressure Sensor reading is too low.
    Possibly disconnected MAP Plug or Short to Ground.
  • MAP Sensor High:
    Manifold Air Pressure Sensor reading is too high.
    Possibly disconnected Vacuum Line or Bad Ground.
  • Baro Pressure Low:
    Manifold Air Pressure Sensor reading is too low during Key On, Engine Off.
    Possibly clogged or check valve on MAP Vacuum Line, or Low 5V Reference Voltage.
  • Water Temp Low:
    Coolant Temperature Sensor reading is too low.
    Possibly disconnected CTS Plug or wiring.
  • Water Temp High:
    Coolant Temperature Sensor reading is too high.
    Engine is too hot, or Possibly CTS is shorted to Ground.
  • Air Temp Low:
    Intake Air Temperature Sensor reading is too low.
    Possibly disconnected IAT Plug or bad wiring.
  • Air Temp High:
    Intake Air Temperature Sensor reading is too high.
    Possibly disconnected IAT Plug or short to ground.
  • Battery Voltage Low:
    Battery Voltage is too low.
    Check Alternator Output, Possibly weak wiring to ECU.
  • Battery Voltage High:
    Battery Voltage is too high.
    Check Alternator Output, Possibly damaged ECU.
  • Battery Crank Weak:
    Battery Voltage while engine cranking is too low.
    Check Battery Health and Charge, Possibly weak wiring to Starter.
  • o2 Sensor Low:
    Oxygen Sensor reading is stuck low.
    Possibly engine is extremely rich, possible short to ground.
  • o2 Sensor High:
    Oxygen Sensor reading is stuck high.
    Likely Dead o2 sensor, possibly o2 Disconnected or engine is extremely lean.
  • o2 Heater Voltage Low:
    Oxygen Sensor Heater Relay Voltage is too low.
    Possibly faulty o2 Relay, ECU stuck in WOT mode.
  • Loop Fault Rich:
    ECU Closed Loop Attempt failed, too rich to correct.
    Possibly too large injectors, other fuel system imbalance.
  • Loop Faul Lean:
    ECU Closed Loop Attempt failed, too lean to correct.
    Possibly faulty o2 sensor, weak fuel pressure, other fuel system imbalance.
  • CPS Crank Fault:
    No Engine RPM Detected after 3 seconds of starter engagement.
    Possibly faulty CPS, engine cranking speed too low.
  • RPM Idle Low:
    Engine Idle RPM too low.
    Possibly damaged IAC valve, dirty Throttle Body, TPS adjustment off.
  • RPM Over Rev:
    Engine RPM too high.
    Engine was revved over 5,000 RPM Redline
  • TPS Too Low:
    Throttle Position Sensor reading is too low.
    Adjust sensor to 17% closed, possibly disconnected, or short to ground.
  • TPS Too High:
    Throttle Position Sensor reading is too high.
    Possibly out of adjustment, or bad ground.
  • Knock Too High:
    Engine Knock Sensor value is too high.
    Possibly bad fuel, too low octane, or mechanical engine issue.
  • Knock Sensor Fault:
    Engine Knock Sensor does not change.
    Possibly bad Knock Sensor or wiring.
  • Distributor Sync:
    Engine Distributor Sync Sensor does not change.
    Possibly bad Distributor Sync Sensor or wiring.
  • Injectors Weak:
    Engine Fuel Injectors are being commanded open too long, Duty Cycle over 80%.
    Possibly injectors are too small, weak fuel pressure, other fuel system imbalance.