What Does P1564 Mean?
During throttle adaptation/relearn procedure, the throttle position sensor voltage read lower than expected minimum. This prevents successful adaptation and affects idle control.
Common Causes
35%
Throttle position sensor degradation or out-of-range signal
25%
Poor electrical connection at throttle body connector
20%
Throttle body mechanical binding preventing full closure
15%
Low voltage supply to throttle position sensor circuit
5%
PCM reference voltage circuit problem
Diagnostic Steps
1
Step 1: Measure throttle position sensor voltage at idle (should be approximately 0.5-0.9V)
2
Step 2: Check 5V reference voltage supply to TPS from PCM
3
Step 3: Inspect throttle body connector for corrosion, bent pins, or moisture
4
Step 4: Manually operate throttle and monitor TPS voltage sweep for dropouts or irregularities
5
Step 5: Check ground circuit integrity and PCM ground connections
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
During throttle adaptation/relearn procedure, the throttle position sensor voltage read lower than expected minimum. This prevents successful adaptation and affects idle control.
The most common cause of P1564 (Idle Speed Control Throttle Position Low Voltage During Adaption) is: Throttle position sensor degradation or out-of-range signal
Typical repair costs for P1564 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause rough idle, stalling, or poor throttle response. Vehicle may stall at stops creating potential safety concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1564 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control / Idle Speed Control
Difficulty
Type
Manufacturer
Recommended Tools
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