P2126 Throttle Position Sensor E Circuit Range/Performance

Description and meaning of DTC p2126

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. The Throttle position sensor is a potentiometer that measures the amount ofthrottle opening. As the throttle is opened, the reading (measured in volts)goes up. The powertrain control module (PCM) is the main computer controlling the vehicle and it supplies a 5 Volt reference signalto the throttle position sensor (TPS) and usually a ground also. A general measurementis: at idle = . 5 Volts full throttle = 4. 5 Volts. If the PCM detects that thethrottle angle is greater or less than it should be for a specific RPM, it willset this code. The E refers to a particular circuit, sensor, or area of a particular circuit.

p2126 diagnostic trouble code symptoms

Symptoms of a P2126 trouble code could include:Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or ServiceEngine Soon light) Intermittent stumble on acceleration or deceleration Blows black smoke on accelerationNo start

DTC p2126 - possible causes

A code P2126 may mean that one or more of the following has happened:TPS has intermittent open or short internallyHarness is rubbing and causing an open or short in the wiring Bad connection at the TPS Bad PCM (less likely) Water or Dorrosion in connector or sensor

How to fix OBD-II diagnostic trouble code p2126

1. If you have access to a scan tool, see what the idle and WOT (wide openthrottle) readings are for the TPS. Check if they're close to the specificationsmentioned above. If not, then replace the TPS and re-check. 2. Check for an intermittent open or short in the TPS signal. To do that, youcan't use a scan tool. You'll need an oscilliscope. The reason is because scantools take samplings of many different readings over just one or two data linesand can miss an intermittent drop out. Hook up your oscilliscope and watch thesignal. It should sweep up and down smoothly with no drop outs or spikes. 3. If no problems were noticed, perform a wiggle test. Do this by wigglingthe connector and harness while watching the pattern. Does it drop out? If so,replace TPS and re-check. 4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts. 5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair. 6. Look for any water in the connector and replace TPS as necessary.

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