Faulty vehicle speed sensor (VSS) or a dirty/damaged tone ring causing erratic speed signals; Wiring damage or corrosion in the speed sensor circuit between the sensor and the PCM; Sticking or binding cruise control servo cable or throttle linkage; Defective cruise control servo or its internal position sensor; PCM software calibration issue or internal fault in the cruise control strategy; Brake pedal switch or clutch switch (on manual) misadjusted or failing, sending conflicting signals; Aftermarket electronic accessories or poor grounds interfering with the speed signal

DTC codes / Chrysler codes / P1564

P1564 · ChryslerCruise Control System Vehicle Accel Too High

Q: What does code P1564 mean?

Cruise Control System Vehicle Accel Too High. P1564 on Chrysler vehicles means the powertrain control module (PCM) has detected that the vehicle speed increased more than the cruise control system expected while cruise was active or being resumed. The PCM monitors vehicle speed against the set target and flags this code when the actual acceleration rate exceeds the calibrated limit, often because the speed signal is erratic or the servo is overreacting.

P1564 on Chrysler vehicles means the powertrain control module (PCM) has detected that the vehicle speed increased more than the cruise control system expected while cruise was active or being resumed. The PCM monitors vehicle speed against the set target and flags this code when the actual acceleration rate exceeds the calibrated limit, often because the speed signal is erratic or the servo is overreacting.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

Cruise control disengages or refuses to engage after the warning light appears
The vehicle may surge or accelerate unexpectedly when cruise is set or resumed
The cruise indicator lamp may flash or stay off when you try to set speed
Often no symptoms besides the warning light, especially if the fault was momentary
A stored code may be accompanied by a pending code or a freeze-frame showing an abrupt speed increase
In some cases the speedometer may fluctuate or read incorrectly if the speed signal is the root cause

Common causes, most likely first

Faulty vehicle speed sensor (VSS) or a dirty/damaged tone ring causing erratic speed signals
Wiring damage or corrosion in the speed sensor circuit between the sensor and the PCM
Sticking or binding cruise control servo cable or throttle linkage
Defective cruise control servo or its internal position sensor
PCM software calibration issue or internal fault in the cruise control strategy
Brake pedal switch or clutch switch (on manual) misadjusted or failing, sending conflicting signals
Aftermarket electronic accessories or poor grounds interfering with the speed signal

How to diagnose and fix it

Scan all modules for stored and pending codes, and record freeze-frame data to see the speed and throttle conditions when P1564 set
Inspect the vehicle speed sensor and its tone ring for metal debris, damage, or loose mounting, and clean or replace as needed
Check the speed sensor wiring and connectors for chafing, corrosion, or loose pins, and repair any faults found
Test the cruise control servo and cable for smooth operation and proper return, lubricating or replacing binding components
Verify brake pedal and clutch pedal switch adjustment and function, replacing switches that do not consistently show the correct state
Check for and remove any aftermarket electronic devices wired into the speed signal or cruise circuit, and ensure grounds are clean and tight
If all hardware checks pass, reprogram the PCM with the latest calibration or replace it only after confirming the fault is internal

Speed Signal Errors Mimic Servo Failure

A dirty or loose wheel speed sensor or tone ring can produce a speed signal that jumps momentarily, which the PCM interprets as excessive acceleration and sets P1564 even though the cruise servo is fine.
On many Chrysler models the cruise control servo shares a connector with the throttle position sensor (TPS) circuit, so a poor connection there can cause both cruise and driveability complaints.
The code can set from a single event, so a clean live-data road test with a scan tool graphing vehicle speed and servo command is often needed to catch an intermittent glitch.
Replacing the cruise servo without checking the speed sensor circuit is a common misdiagnosis; always verify the speed signal is stable before condemning the servo.
Aftermarket remote starters or alarm systems that tap into the speed wire can introduce noise that triggers P1564, so inspect for non-factory wiring first.

Can I keep driving with P1564?

You can usually drive the vehicle, but avoid using cruise control until the fault is repaired because an unexpected acceleration event could be unsafe. If the vehicle surges or the speedometer fluctuates, have it checked promptly.

Tools that help

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