# 2003 Chevrolet Silverado 1500 ABS code C0237

**URL:** <https://community.cartalk.com/t/2003-chevrolet-silverado-1500-abs-code-c0237/132406>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, silverado1500\
**Created:** [January 10, 2019, 9:39pm UTC](https://community.cartalk.com/t/2003-chevrolet-silverado-1500-abs-code-c0237/132406 "2019-01-10T21:39:07Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![attilasztricsek](https://avatars.discourse-cdn.com/v4/letter/a/c67d28/32.png) [@attilasztricsek](https://community.cartalk.com/u/attilasztricsek)\
**Post date:** [January 10, 2019, 9:39pm UTC](https://community.cartalk.com/t/2003-chevrolet-silverado-1500-abs-code-c0237/132406/1 "2019-01-10T21:39:07Z")

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abs c0237 code  
aredy change: front hub, rotor ,pad, weel sdeedsensor,brake pad.

now ; rear , new brake pad , and e-brake,

now wat??? its still ABS light it on

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**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\
**Post date:** [January 10, 2019, 10:12pm UTC](https://community.cartalk.com/t/2003-chevrolet-silverado-1500-abs-code-c0237/132406/2 "2019-01-10T22:12:57Z")

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Erratic rear speed sensor fault could come from bad sensor, bad connection, bad connector, bad wiring, or damaged tone wheel.

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**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:** [January 10, 2019, 10:37pm UTC](https://community.cartalk.com/t/2003-chevrolet-silverado-1500-abs-code-c0237/132406/3 "2019-01-10T22:37:32Z")

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> [@attilasztricsek](#):
>
> c0237

Or bad ABS unit.

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**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\
**Post date:** [January 12, 2019, 3:26am UTC](https://community.cartalk.com/t/2003-chevrolet-silverado-1500-abs-code-c0237/132406/4 "2019-01-12T03:26:10Z")

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> [@attilasztricsek](#):
>
> abs c0237

> **[Code C0237 Chevrolet: Erratic Rear Speed Signal (With Video)](https://www.autocodes.com/c0237_chevrolet.html)**
>
> As the wheel spins, the wheel speed sensor produces an Alternating Current (AC) signal. The Electronic Brake Control Module (EBCM) uses the frequency of

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [January 12, 2019, 3:46am UTC](https://community.cartalk.com/t/2003-chevrolet-silverado-1500-abs-code-c0237/132406/5 "2019-01-12T03:46:56Z")

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You need a shop that has a lab o’scope . the techs can use that instrument to inspect the signal produced by the wheel speed sensors as the wheels are manually rotated with the car on the lift. There’s probably only one of the sensor’s that’s causing the problem. If all 4 wheel’s signals look ok, then that narrows it down considerably b/c it means the problem is in the wiring from the sensors to the abs unit, or the abs unit itself.

The signal as displayed on the o’scope will look something like this

-------…----------…--------

where the vertical direction is voltage, and the horizontal is time. A faulty one will look like this

-------------------------------------------------…------------------------------------…

or

---------------------------.-------------.-----------------.-------------

etc

A shop w/the chevy oem scan tool can probably inspect the signals that way also.