P1232 Mercedes-Benz Fuel Pump Speed Primary Circuit Malfunction

P1232 Mercedes-Benz Fuel Pump Speed Primary Circuit Malfunction

Possible causes
  • Open or shorted low fuel pump (LFP) circuit.
  • Open VPWR to the low speed fuel pump relay.
  • Damaged low speed fuel pump relay.
  • Damaged PCM.

    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1232 Mercedes-Benz Description

    The PCM monitors the low speed fuel pump (LFP) primary circuit output from the PCM. The test fails if: the LFP circuit is commanded ON (grounded), and excessive current draw is detected on the LFP circuit; or, the LFP circuit is commanded OFF, and voltage is not detected on the LFP circuit. The PCM expects to detect VPWR voltage through the low speed fuel pump relay coil to the LFP circuit.

    Mercedes-Benz Vehicle:Mercedes-Benz C-Class,Mercedes-Benz CL-Class,Mercedes-Benz CLK-Class,Mercedes-Benz CLS-Class,Mercedes-Benz E-Class,Mercedes-Benz G-Class,Mercedes-Benz GL-Class,Mercedes-Benz GLK-Class,Mercedes-Benz M-Class,Mercedes-Benz R-Class,Mercedes-Benz S-Class,Mercedes-Benz SL-Class,Mercedes-Benz SLK-Class,Mercedes-Benz SLS-Class,Mercedes-Benz Sprinter 2500,Mercedes-Benz Sprinter 3500,
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