{"id":36565,"date":"2016-09-28T14:50:32","date_gmt":"2016-09-28T19:50:32","guid":{"rendered":"http:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=36565"},"modified":"2016-09-28T14:50:32","modified_gmt":"2016-09-28T19:50:32","slug":"code-p1125-chevy-silverado-2500","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2016\/09\/code-p1125-chevy-silverado-2500","title":{"rendered":"Code P1125 Chevy Silverado 2500"},"content":{"rendered":"

\"2005I have diagnostic trouble code P1125 come up what does it mean?<\/p>\n

\n

RESPONSE<\/p>\n

Code P1125 – Accelerator Pedal Position Sensor Fault<\/h2>\n

The accelerator pedal position (APP) sensor 1 and the APP sensor 2 are potentiometer type sensors, each with the following circuits:<\/p>\n

\u2022 A 5-volt reference circuit<\/p>\n

\u2022 A low reference circuit<\/p>\n

\u2022 A signal circuit<\/p>\n

The control module provides the APP sensors with a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module signal voltages proportional to pedal movement. The APP sensor 1 signal voltage is low at rest and increases as the pedal is depressed.<\/p>\n

The APP sensor 2 signal voltage is low at rest and increases as the pedal is depressed. When the control module detects that the APP sensor 1 and the APP sensor 2 signal circuits are out of correlation with each other, DTC P1125 sets.<\/p>\n

The Powertrain Control Module (PCM)<\/a> detects that the difference between Accelerator Pedal Position (APP) sensor 1 and APP sensor 2 is more than the predicted value.<\/p>\n

Code P1125 Possible causes<\/h3>\n

– Faulty Accelerator Pedal Position Sensor
\n– Accelerator Pedal Position Sensor harness is open or shorted
\n– Accelerator Pedal Position Sensor circuit poor electrical connection<\/p>\n

Code P1125 Diagnostic Chart<\/h3>\n

Circuit Description<\/h3>\n

The accelerator pedal position (APP) sensor 1 and the APP sensor 2 are potentiometer type sensors, each with the following circuits:<\/p>\n\n\n\n
\u2022<\/td>\nA 5-volt reference circuit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nA low reference circuit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nA signal circuit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The control module provides the APP sensors with a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module signal voltages proportional to pedal movement. The APP sensor 1 signal voltage is low at rest and increases as the pedal is depressed. The APP sensor 2 signal voltage is low at rest and increases as the pedal is depressed. When the control module detects that the APP sensor 1 and the APP sensor 2 signal circuits are out of correlation with each other, Code P1125 sets.<\/p>\n

Conditions for Running the Diagnostic Trouble COde<\/h3>\n\n\n\n
\u2022<\/td>\nDTC P1518, P2108 or U0107 is not set.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nThe ignition is in the Crank or Run position.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nThe ignition voltage is more than 5.23 volts.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nThe communication between the throttle actuator control (TAC) module and the powertrain control module (PCM) must be valid.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Conditions for Setting the DTC<\/h3>\n

The PCM detects that the difference between APP sensor 1 and APP sensor 2 is more than the predicted value.<\/p>\n

Action Taken When the DTC Sets<\/h3>\n\n\n\n
\u2022<\/td>\nThe control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nThe control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and\/or the Failure Records.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nThe control module commands the TAC system to operate in the Reduced Engine Power mode.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nA message center or an indicator displays Reduced Engine Power.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nUnder certain conditions the control module commands the engine OFF.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Conditions for Clearing the MIL\/DTC<\/h3>\n\n\n\n
\u2022<\/td>\nThe control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nA current DTC, Last Test Failed, clears when the diagnostic runs and passes.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nA history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\u2022<\/td>\nClear the MIL and the DTC with a scan tool.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n
Step<\/th>\nAction<\/th>\nValues<\/th>\nYes<\/th>\nNo<\/th>\n<\/tr>\n
Schematic Reference: Engine Controls Schematics<\/em><\/p>\n

Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views<\/em><\/td>\n<\/tr>\n

1<\/td>\nDid you perform the Diagnostic System Check – Engine Controls?<\/td>\n—<\/td>\nGo to Step 2<\/td>\nGo to Diagnostic System Check – Engine Controls<\/td>\n<\/tr>\n
2<\/td>\nRecord the throttle actuator control (TAC) module calibration with a scan tool.<\/p>\n

Does the TAC module calibration match the part number of the TAC module?<\/td>\n

—<\/td>\nGo to Step 3<\/td>\nGo to Step 11<\/td>\n<\/tr>\n
3<\/td>\nObserve the DTC Information with a scan tool.<\/p>\n

Is DTC P2120 or P2125 also set?<\/td>\n

—<\/td>\nGo to Diagnostic Trouble Code (DTC) List<\/td>\nGo to Step 4<\/td>\n<\/tr>\n
4<\/td>\n\n
    \n
  1. Turn OFF the ignition for 30 seconds.<\/li>\n
  2. Turn ON the ignition, with the engine OFF.<\/li>\n
  3. Observe the APP Sensors 1 and 2 parameter with a scan tool.<\/li>\n<\/ol>\n

    Does the scan tool indicate that the APP sensors 1 and 2 parameters disagree?<\/td>\n

—<\/td>\nGo to Step 5<\/td>\nGo to Intermittent Conditions<\/td>\n<\/tr>\n
5<\/td>\n\n
    \n<\/ol>\n
      \n
    1. Turn OFF the ignition.<\/li>\n
    2. Disconnect the accelerator pedal position (APP) sensor.<\/li>\n
    3. Disconnect the TAC module.<\/li>\n
    4. Measure the resistance of the following circuits for each of the APP sensors with a DMM:<\/li>\n<\/ol>\n\n\n\n
      \u2022<\/td>\nThe low reference circuit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
      \u2022<\/td>\nThe signal circuit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n\n
      \u2022<\/td>\nThe 5-volt reference circuit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Is the resistance more than the specified value for any circuit?<\/td>\n

      		5 ?<\/td>\nGo to Step 9<\/td>\nGo to Step 6<\/td>\n<\/tr>\n
      6<\/td>\nTest the signal circuit of the APP sensor 1 for a short to the signal circuit of the APP sensor 2. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.<\/p>\n

      Did you find and correct the condition?<\/td>\n

      		—<\/td>\nGo to Step 12<\/td>\nGo to Step 7<\/td>\n<\/tr>\n
      7<\/td>\nTest for an intermittent and for a poor connection at the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.<\/p>\n

      Did you find and correct the condition?<\/td>\n

      		—<\/td>\nGo to Step 12<\/td>\nGo to Step 8<\/td>\n<\/tr>\n
      8<\/td>\nTest for an intermittent and for a poor connection at the APP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.<\/p>\n

      Did you find and correct the condition?<\/td>\n

      		—<\/td>\nGo to Step 12<\/td>\nGo to Step 10<\/td>\n<\/tr>\n
      9<\/td>\nRepair the high resistance in the circuit that measured above the specified value. Refer to Wiring Repairs in Wiring Systems.<\/p>\n

      Did you find and correct the condition?<\/td>\n

      		—<\/td>\nGo to Step 12<\/td>\n—<\/td>\n<\/tr>\n
      10<\/td>\nReplace the APP sensor. Refer to Accelerator Pedal Position Sensor Replacement.<\/p>\n

      Did you complete the replacement?<\/td>\n

      		—<\/td>\nGo to Step 12<\/td>\n—<\/td>\n<\/tr>\n
      11<\/td>\nReplace the TAC module. Refer to Electronic Throttle Actuator Control Module Replacement.<\/p>\n

      Did you complete the replacement?<\/td>\n

      		—<\/td>\nGo to Step 12<\/td>\n—<\/td>\n<\/tr>\n
      12<\/td>\n\n
        \n
      1. Assemble the vehicle, as necessary.<\/li>\n
      2. Clear the DTCs with a scan tool.<\/li>\n
      3. Start the engine.<\/li>\n
      4. Operate the system in order to verify the repair.<\/li>\n<\/ol>\n

        Did the DTC fail this ignition?<\/td>\n

      		—<\/td>\nGo to Step 2<\/td>\nGo to Step 13<\/td>\n<\/tr>\n
      13<\/td>\nImportant: <\/strong>Be aware that repairing one individual condition may correct more than one DTC.<\/p>\n

      Observe the Capture Info with a scan tool.<\/p>\n

      Are there any DTCs that have not been diagnosed?<\/td>\n

      		—<\/td>\nGo to Diagnostic Trouble Code (DTC) List<\/td>\nSystem OK<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

      I have diagnostic trouble code P1125 come up what does it mean? RESPONSE Code P1125 – Accelerator Pedal Position Sensor Fault The accelerator pedal position (APP) sensor 1 and the APP sensor 2 are potentiometer type sensors, each with the following circuits: \u2022 A 5-volt reference circuit \u2022 A low reference circuit \u2022 A signal… Read More »Code P1125 Chevy Silverado 2500<\/span><\/a><\/p>\n","protected":false},"author":13962,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,3],"tags":[10953,10954,393],"class_list":["post-36565","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-chevy","tag-code-p1125","tag-code-p1125-diagnostic-chart","tag-silverado"],"yoast_head":"\nCode P1125 Chevy Silverado 2500 - FreeAutoMechanic Advice<\/title>\n<meta name=\"description\" content=\"I have code P1125 come up what does it mean? 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