# Truck feels sluggish and feels like it's over revving before it shifts. But it's not a tranny issue, throttle body? Or mass airflow sensor? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, 1500\ **Created:** [May 15, 2017, 1:30am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933 "2017-05-15T01:30:59Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![fitznbrooks23](https://avatars.discourse-cdn.com/v4/letter/f/8baadc/32.png) [@fitznbrooks23](https://community.cartalk.com/u/fitznbrooks23)\ **Post date:** [May 15, 2017, 1:30am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/1 "2017-05-15T01:30:59Z")
Acceleration from 1-2 is sluggish and feels like a slip into 2nd but seems like it’s struggling had check engine light on and throttle body came up. Cleaned it and helped a little but still does it. Maybe TB is faulty? ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [May 15, 2017, 3:05am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/2 "2017-05-15T03:05:15Z")
What year? What engine? I know it’s a Chevy 1500, but WHAT Chevy 1500 . . . ? Chevy 1500 Express? Chevy 1500 Silverado? And what exact code . . . there are MANY codes related to the throttle body, which one? ---
**Author:** ![fitznbrooks23](https://avatars.discourse-cdn.com/v4/letter/f/8baadc/32.png) [@fitznbrooks23](https://community.cartalk.com/u/fitznbrooks23)\ **Post date:** [May 15, 2017, 3:15am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/3 "2017-05-15T03:15:48Z")
It’s a 2003 Silverado 1500. 5.3 vortec 4x4 and the codes are p2135 and p1515 and p0106 ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [May 15, 2017, 3:59am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/4 "2017-05-15T03:59:14Z")
@cdaquila Another request to merge an OP’s threads. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [May 15, 2017, 11:47am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/5 "2017-05-15T11:47:49Z")
P2135 is a bad throttle position switch. Could cause a reduced throttle condition. Replace that first. The p1515 relates to the fist and MAY go away when you replace the TPS. Same for the p0106, the MAP sensor code. Before you replace anything, there are 2 ground connections to the frame under the driver’s side floor on the outside of the frame. Clean both grounds and re-connect. You can also put them under the same screw to save a little work and force a good connection. Clear the codes and see what come back. ---
**Author:** ![fitznbrooks23](https://avatars.discourse-cdn.com/v4/letter/f/8baadc/32.png) [@fitznbrooks23](https://community.cartalk.com/u/fitznbrooks23)\ **Post date:** [May 15, 2017, 3:05pm UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/6 "2017-05-15T15:05:19Z")
Thanks mustang, I’ll try that first! ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [May 16, 2017, 12:04am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/7 "2017-05-16T00:04:34Z")
No separate tps on this vehicle It’s electronic throttle ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [May 16, 2017, 12:17am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/8 "2017-05-16T00:17:34Z")
The DTC P2135 points to a problem with the accelerator pedal position sensor. [https://www.carid.com/dorman/accelerator-pedal-position-sensor-mpn-699-101.html](https://www.carid.com/dorman/accelerator-pedal-position-sensor-mpn-699-101.html) This can really mess the computer up if it’s faulty. Tester ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [May 16, 2017, 12:28am UTC](https://community.cartalk.com/t/truck-feels-sluggish-and-feels-like-its-over-revving-before-it-shifts-but-its-not-a-tranny-issue-throttle-body-or-mass-airflow-sensor/103933/9 "2017-05-16T00:28:16Z")
THROTTLE POSITION SENSOR 1, 2 RANGE/PERF. \*P2135 1) TACM indicates a continuous or intermittent correlation fault between TP sensors #1 and #2. OR 2) TACM indicates an invalid minimum mechanical position correlation between TP sensor #1 and #2. OR 3) TPS1 signal short to TPS2 signal, Any reference, or ground. COMMAND vs ACTUAL THROTTLE PERF. (PCM) \*P1515 Indicates that the PCM has detected a throttle positioning error MAP SENSOR RANGE/ PERFORMANCE(RA TIONALITY) P0106 This DTC determines if the MAP sensor is stuck within the normal operation range This was straight from [acdelcotechconnect.com](http://acdelcotechconnect.com) . . . specifically the mode 6 data section All the malfunction criteria, enable conditions, etc. are to be found there With a decent multimeter and some common sense, I think it could be determined fairly quickly if the electronic throttle body is working properly, or not. Of course, it might be a good idea to check the 5V references and grounds, also, but that should be part of the diagnosis, anyways