2002 Grand Caravan. ABS light and emergency brake light on too.

Tiny
MARACUYA68
  • MEMBER
  • 2002 DODGE CARAVAN
  • 125,000 MILES
Replaced missing speed sensor on the front driver's side wheel. AAMCO free diagnose says codes 10, 11, 12, 13, 14, 20 and 21. I don't trust AAMCO. Their mechanic says either all the sensors, the pump or ABS module could be wrong. They would cahrge close to $200 to diagnose. Any suggestions?
Thursday, February 23rd, 2012 AT 2:35 AM

26 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I doubt all the speed sensors all went bad at the same time. Are you sure the codes do have a letter followed by more numbers?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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They just gave me those codes, AAMCO does not really want to diagnos for free. These lights started lighting up after the transmission and engine heads were replaced. One more clue OI just thought of. The automatic door locks (they lock the doors after you are going above 15 MPH) have stopped working. It makes sense that this is controlled by a speed sensor. Brake lights do work, speedometer works fine too.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
SATURNTECH9
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So after you had thr transmission replaced and the engines cylinder heads replaced the abs light has been on?You said something about a missing wheel speed sensor so that would have turned the abs light on also. So iam a little confused.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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After they did these things both lights came on. Then I noticed the speed sensor missing. Bought and installed new SS. After that AAmco and the rest of the story.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
SATURNTECH9
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Then the first thing I would look for is damaged or pinched wires etc. Where the transmission meets the engine etc.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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Makes sense, I will do that and report back
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
SATURNTECH9
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That makes the most sense let me know what you find.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
MARACUYA68
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Well, visual inspection led to no findings, Now the vehicle won't start and the ASD fuse keeps blowing, mechanic says the PCM is shorted and needs to be replaced. Does this sound correct?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
SATURNTECH9
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So did the van just suddenly stop starting and the asd fuse started blowing?Or did some event led up to this?Just trying to gwt all the facts.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
MARACUYA68
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Other than the check engine, abs and brake lichts the car was running great, then on Friday, without any preamble, it stopped. I replaced the 15 amp fuse labled ASD, and as soon as I started cranking, it blew again, three fuses later, I think there might be a short. Mechanic removes fuse box and wiring harness but there is no chaffing or broken wires, he tests the harness terminal and then decides the PCL is in short.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
SATURNTECH9
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So while cranking only the fuse blows?Have you tried unhooking the starter wires taping the ends of the wires up then turn the key to the start position to see if the short is gone?I wouldnt suspect the pcm blowing that fuse during cranking.I would be looking at the wires going down to the starter especially the little one going to the starter for the starter trigger. Also the starter itself.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
MARACUYA68
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I see, now why would this happen all of a sudden and while driving?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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An if the started was shorted, would the fuse not blow in the on position? I other words if the started is unplugged and I turn the key to on, it should not blow the fuse if it were the PCM?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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There is always power going to the starter at all times when you turn the key to the start position where the starter is cranking the engine. There is a small trigger wire that sends power to the starter solenoid. The solenoid sends the power into the starter windings and the bendix out to the flex plate. So does the fuse bkow in the run position?Or only the start position on the key switch?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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Ok, I will test that, it sounds a lot cheaper and much more logicall then a pcm, so in a sense this would be unrelated to the christmas light show in the brake system?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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Dont know about the abs light because we dont know what was causing that.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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Hmmm. Ok, so it is unrelated, does my van have an ASD relay?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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Yes you have a auto shut down relay. What is the fuse number thay is blowing?
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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OK, so there were a couple of "fused" wires in the main harness. The car starts now but I get a code P0888 and P0700. I have found "fused" and exposed wires in the fuel injection harness. I am hoping to be able to replace the harness this week. Something does not sound right.
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Monday, July 6th, 2020 AT 5:23 PM
Tiny
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P0700 means there is transmission codes I posted the troublke tree for code P0888.P0888 means relay output always off.
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Monday, July 6th, 2020 AT 5:23 PM

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