01 P0021 A camshaft postion - timing over-advanced or system p… • 02 This Is Why Your Car’s EGR Valve Is Stuck • 03 Modern Vehicle Hacking: A Comprehensive Guide to Safeguard … • 04 P0031 H02S heater control circuit low (Bank 1 sensor 1) • 05 The Latest Advances in 3D Printing: How This Technology is … • 06 What is the Purpose of Hazard Lights and How to Use Them Pr… • 07 The Overlooked Car Part That Turns Every Drive Into A Fuel … • 08 The Risks of Driving at Low RPMs: How to Avoid Engine Damag… • 09 Signs of a Failing Transmission Control Module (TCM) • 10 The Benefits of ABS: Why You Need This Safety Feature in Yo… •

DTC codes / Chrysler codes / P1375

P1375 · Chrysler24X Reference Circuit High Voltage

P1375 on Chrysler vehicles means the powertrain control module (PCM) has detected an abnormally high voltage on the 24X reference circuit, which is the crankshaft position signal used to synchronize ignition and fuel delivery. The PCM expects a clean square wave that toggles between low and high voltage as the crankshaft turns, and a high-voltage condition tells it the signal is stuck above the acceptable threshold or the return path is compromised.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • The check engine light is illuminated, often with no other noticeable symptoms.
  • The engine may crank but fail to start, or start and stall immediately.
  • Intermittent misfire or rough running, especially at idle or under light load.
  • A sudden loss of power or hesitation during acceleration.
  • The tachometer may read erratically or drop to zero while driving.
  • In some cases the engine may stall without warning and restart after a cool-down period.

Common causes, most likely first

  1. A damaged or chafed 24X reference signal wire shorting to a voltage source or rubbing through insulation.
  2. A faulty crankshaft position sensor (24X sensor) internally shorted and pulling the signal high.
  3. Poor electrical connection at the sensor or PCM connector, including corrosion or backed-out pins.
  4. A failed PCM driver or internal pull-up resistor on the 24X reference circuit.
  5. Excessive air gap between the sensor and the tone ring, or a damaged tone ring causing an erratic signal.
  6. Electrical interference from aftermarket ignition components or poorly routed wiring near the sensor harness.

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, then clear codes and test-drive to see if P1375 returns immediately.
  2. Visually inspect the 24X sensor wiring harness from the sensor to the PCM for chafing, heat damage, or loose connectors.
  3. Back-probe the 24X signal circuit at the PCM and measure voltage with a digital multimeter while cranking; compare to specification.
  4. Check the sensor's air gap and tone ring condition, and replace the sensor if the gap is out of spec or the ring is damaged.
  5. Perform a voltage drop test on the sensor ground and reference circuits to rule out high resistance in the return path.
  6. If wiring and sensor check out, substitute a known-good PCM or use a lab scope to confirm the PCM is misreading a clean signal.
  7. After repair, clear codes and verify the 24X signal with a lab scope or scan tool live data during a road test.

What the 24X code hides from you

  • A high-voltage code on the 24X circuit often originates from a short to voltage on the signal wire rather than a failed sensor, so replacing the sensor first is a common misdiagnosis.
  • The 24X reference circuit shares a ground path with other sensors on some Chrysler engines, and a bad ground can pull the signal high without any sensor fault.
  • Intermittent P1375 codes that appear only after the engine warms up often trace to a sensor that breaks down thermally, not to a wiring issue.
  • Aftermarket remote starters or alarm systems spliced into the crank signal wiring can introduce voltage spikes that set this code.
  • A lab scope pattern is the only reliable way to confirm whether the PCM is seeing a distorted signal or the PCM itself is misinterpreting a clean one.

Can I keep driving with P1375?

You can drive cautiously if the engine runs normally and the light is steady, but avoid hard acceleration and long trips because a failing 24X signal can cause sudden stalling. If the engine stalls, misfires, or fails to restart, stop driving and have the vehicle towed for diagnosis.

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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage