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DTC codes / Chrysler codes / P1526

P1526 · ChryslerTP Sensor Learn Not Complete

P1526 on Chrysler vehicles means the powertrain control module (PCM) has not successfully completed the throttle position (TP) sensor learn procedure, so it cannot trust the TP sensor signal for accurate throttle control. The PCM detects this when the ignition is cycled or a scan tool requests the learn routine and the sensor voltage does not fall within the expected range for closed throttle, or the learn timer expires without a valid reading.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • Rough or erratic idle, sometimes accompanied by a hanging or fluctuating engine speed.
  • Delayed or harsh transmission shifts because the PCM lacks a valid throttle position reference.
  • Reduced engine power or limp-home mode in some cases, depending on how the PCM reacts to the missing learn.
  • Poor fuel economy or a rich-running condition if the PCM defaults to a fixed throttle value.
  • Intermittent stalling when coming to a stop, especially if the TP sensor signal is unstable.

Common causes, most likely first

  1. Throttle position sensor (TPS) voltage out of specification at closed throttle, often due to a worn sensor or incorrect adjustment.
  2. Carbon buildup or mechanical binding on the throttle plate or bore preventing a true closed-throttle position.
  3. Damaged or corroded wiring in the TP sensor circuit, including the 5-volt reference, signal, or ground wires.
  4. A faulty or improperly installed TP sensor after recent repairs or replacement.
  5. PCM software or memory issue that prevents the learn routine from completing, sometimes fixed by a reflash or battery disconnect.
  6. A stuck or misadjusted accelerator pedal or cruise control cable holding the throttle slightly open.
  7. Low battery voltage or poor grounds causing the PCM to abort the learn procedure during ignition cycling.

How to diagnose and fix it

  1. Connect a scan tool and check for other stored codes, then clear them and attempt the TP sensor learn procedure as described in the factory service information.
  2. Inspect the throttle body for carbon buildup and clean it thoroughly with throttle body cleaner, then reattempt the learn.
  3. Backprobe the TP sensor connector and measure signal voltage at closed throttle; compare to specification and replace the sensor if out of range.
  4. Check the TP sensor wiring for continuity, shorts, and corrosion between the sensor and PCM, repairing any damaged sections.
  5. Verify battery voltage and ground integrity, charging or replacing the battery if it is weak, then repeat the learn procedure.
  6. If the sensor and wiring are good, check for a PCM software update or perform a relearn with a capable scan tool before condemning the PCM.
  7. After any repair, clear codes and complete a road test with several ignition cycles to confirm the learn completes and the code does not return.

Why the TP Learn Keeps Failing

  • A dirty throttle body is the most common cause of an incomplete TP learn on Chrysler vehicles, because even a thin layer of carbon holds the plate open just enough to keep the closed-throttle voltage out of range.
  • Many technicians replace the TP sensor unnecessarily when the real problem is a binding throttle cable or a pedal assembly that does not return fully, so always verify the throttle plate closes completely before condemning the sensor.
  • The learn procedure often requires a specific sequence of ignition cycles and idle time, and attempting it with a low battery or aftermarket scan tool that does not support the routine will leave the code set even with good components.
  • P1526 can appear after a battery replacement or PCM reset simply because the learn was never performed, so a relearn may be the only fix needed on an otherwise healthy vehicle.
  • On some Chrysler models, a failing accelerator pedal position sensor can prevent the TP learn from completing even though the TP sensor itself tests good, so check both sensors when the code persists.

Can I keep driving with P1526?

You can usually drive the vehicle short distances to a repair shop, but avoid aggressive acceleration or heavy load because the PCM may be using a default throttle value that affects shifting and engine power. If the engine idles poorly or stalls, stop driving and have it diagnosed promptly.

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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