What Does P1219 Mean?
P1219 indicates an intermittent signal from the Accelerator Pedal Position Sensor B circuit. The ECM has detected signal dropouts, spikes, or erratic voltage changes on the secondary accelerator pedal position sensor. Modern drive-by-wire throttle systems use redundant sensors, so an intermittent fault on sensor B may cause the ECM to enter a reduced-power limp mode for safety.
Safety Warning
Intermittent pedal position sensor faults can trigger sudden reduced-power mode, causing unexpected deceleration in traffic. In a worst case, an erratic signal could cause unintended acceleration or throttle response issues, posing a serious safety risk.
Common Causes
30%
Worn or failing accelerator pedal position sensor with intermittent internal contact
25%
Loose or corroded connector at the accelerator pedal assembly
20%
Damaged or chafed wiring in the pedal position sensor harness
15%
Poor ground connection for the pedal position sensor circuit
10%
Contamination or moisture in the pedal position sensor assembly
Diagnostic Steps
1
Monitor the Pedal Position Sensor B signal in real-time using a scan tool while slowly sweeping the pedal through its full range. Look for dropouts, spikes, or flat spots in the signal.
2
Inspect the accelerator pedal connector for corrosion, bent pins, loose terminals, and proper engagement. Wiggle the connector while monitoring the sensor signal.
3
Check the wiring harness from the pedal assembly to the ECM for chafing, especially where it passes through the firewall or under the dash carpet.
4
Verify the reference voltage (typically 5V) and ground circuit at the pedal sensor connector are stable and within specification.
5
Compare Pedal Position Sensor A and Sensor B outputs on a dual-trace scope to identify discrepancies that indicate which sensor is failing.
6
If the sensor is integrated into the pedal assembly (common in modern vehicles), replace the entire accelerator pedal assembly.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
P1219 indicates an intermittent signal from the Accelerator Pedal Position Sensor B circuit. The ECM has detected signal dropouts, spikes, or erratic voltage changes on the secondary accelerator pedal position sensor. Modern drive-by-wire throttle systems use redundant sensors, so an intermittent fa...
The most common cause of P1219 (Pedal Position Sensor B Circuit Intermittent) is: Worn or failing accelerator pedal position sensor with intermittent internal contact
Typical repair costs for P1219 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent pedal position sensor faults can trigger sudden reduced-power mode, causing unexpected deceleration in traffic. In a worst case, an erratic signal could cause unintended acceleration or throttle response issues, posing a serious safety risk.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1219 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control / Drive-by-Wire
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