What Does P1147 Mean?
This code indicates a malfunction in the Electronic Throttle System (ETS) sub accelerator position sensor 1. This sensor provides throttle pedal position feedback to the ECM as part of a drive-by-wire throttle control system. The ECM has detected that the sensor output is out of its expected range, erratic, or not correlating with the primary accelerator position sensor. The ETS system typically uses redundant sensors for safety verification.
Safety Warning
This is a safety-critical component. A faulty accelerator position sensor can cause the vehicle to enter reduced power or limp mode, severely limiting acceleration. In rare failure modes, it could cause unintended acceleration or failure to respond to pedal input. Repair promptly.
Common Causes
30%
Faulty accelerator pedal position sensor 1 (internal wear or failure)
25%
Damaged or corroded wiring to the accelerator pedal position sensor
20%
Corroded or loose connector at the accelerator pedal assembly
15%
5V reference voltage supply issue affecting the sensor
10%
Accelerator pedal assembly mechanical damage or contamination
Diagnostic Steps
1
Monitor APP (Accelerator Pedal Position) Sensor 1 and Sensor 2 voltages simultaneously while slowly pressing the pedal; both should track proportionally.
2
Check for smooth, linear voltage increase from APP Sensor 1 as the pedal is slowly depressed; look for dropouts or jumps.
3
Inspect the accelerator pedal connector for corrosion, bent pins, or moisture intrusion.
4
Verify the 5V reference voltage is present and stable at the sensor connector.
5
Check the sensor ground circuit for continuity and low resistance back to the ECM.
6
If the sensor is integrated into the pedal assembly, replace the entire pedal assembly.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
This code indicates a malfunction in the Electronic Throttle System (ETS) sub accelerator position sensor 1. This sensor provides throttle pedal position feedback to the ECM as part of a drive-by-wire throttle control system. The ECM has detected that the sensor output is out of its expected range, ...
The most common cause of P1147 (ETS Sub Accel Position Sensor 1 Malfunction) is: Faulty accelerator pedal position sensor 1 (internal wear or failure)
Typical repair costs for P1147 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a safety-critical component. A faulty accelerator position sensor can cause the vehicle to enter reduced power or limp mode, severely limiting acceleration. In rare failure modes, it could cause unintended acceleration or failure to respond to pedal input. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1147 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
