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DTC codes / Chrysler codes / P1433

P1433 · ChryslerFuel Level Sensor 2 Circuit High Voltage

P1433 on a Chrysler vehicle means the powertrain control module (PCM) has detected a high-voltage condition on the fuel level sensor 2 circuit, which is the secondary sensor used on some two-tank or dual-sending-unit systems. The PCM monitors the signal voltage from that sensor and flags the code when the voltage stays above the expected range for the fuel level being reported.

SystemPowertrain
Code typeChrysler specific
SeverityLow
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • The check engine light or service engine soon light is illuminated on the dashboard.
  • The fuel gauge may read incorrectly, often showing full or pegged high when the tank is not actually full.
  • The fuel gauge may fluctuate or drop to empty intermittently as the signal cuts in and out.
  • A fuel level warning or low-fuel message may appear at the wrong time.
  • Often no symptoms besides the warning light, especially if the primary fuel level sensor still provides a usable signal.
  • On vehicles with dual tanks, the gauge may switch erratically between readings from the two senders.

Common causes, most likely first

  1. A short to voltage on the fuel level sensor 2 signal wire, often from chafed insulation against a body or frame ground point.
  2. A faulty fuel level sensor 2 sending unit inside the tank, with a worn or open internal resistor track causing the signal to ride high.
  3. Corroded or pushed-back terminals at the fuel pump module connector or at the PCM connector for the sensor 2 circuit.
  4. An open ground circuit for fuel level sensor 2, which forces the signal voltage high because the sensor no longer has a proper return path.
  5. Damage to the wiring harness where it passes through the tank module flange or along the frame rail, commonly from road debris or prior service work.
  6. A failed PCM driver or internal pull-up circuit on the sensor 2 input, though this is far less common than wiring or sender faults.
  7. Water intrusion into the fuel pump module connector causing intermittent high-voltage readings.

How to diagnose and fix it

  1. Connect a scan tool and read fuel level sensor 2 voltage live data while gently wiggling the harness at the tank and PCM to see if the reading jumps.
  2. Visually inspect the fuel pump module connector and the PCM connector for corrosion, pushed pins, or loose terminals, and repair as needed.
  3. Disconnect the sensor 2 connector and measure resistance across the sender while moving the float arm through its travel to check for dead spots or an open circuit.
  4. With the sensor disconnected, check the signal wire for a short to voltage by measuring voltage at the sensor connector with the key on and comparing to the expected reference.
  5. Check the ground circuit for the sensor 2 sender with a voltage drop test while the circuit is loaded, repairing any high-resistance ground.
  6. If wiring and grounds pass, replace the fuel level sensor 2 sending unit or the complete fuel pump module assembly as required by the tank design.
  7. Clear the code and verify the repair by cycling the key, running the engine, and confirming the fuel level voltage stays within the normal range on the scan tool.

What the fuel gauge is not telling you

  • A high-voltage reading on sensor 2 often comes from an open ground rather than a short to power, so technicians who only chase shorts miss the real fault.
  • On Chrysler vehicles with a single tank and two senders, the PCM may blend both signals, so a bad sensor 2 can make the gauge read full even when the tank is half empty.
  • The fuel level sensor 2 circuit is sometimes routed through a connector above the fuel tank that is exposed to road spray, and corrosion there mimics a failed sender.
  • P1433 can set intermittently on rough roads when a chafed signal wire touches a voltage source only during body flex, so a static meter test may look normal.
  • Replacing the fuel pump module without checking the ground circuit at the tank flange often leads to a repeat code because the new sender sees the same high-voltage condition.

Can I keep driving with P1433?

This code is safe to drive with in most cases because it affects fuel level reporting rather than engine operation, but you should refuel based on mileage rather than the gauge until it is repaired. Avoid long trips into remote areas where an inaccurate gauge could leave you stranded.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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