Share
Ask OBDII Question

15,717 questions

7,816 answers

616 comments

3,529 users

Top Users

Reynaldo (2637 Points)
OBDIITech (2457 Points)
G37driver (1769 Points)
milonajo1 (737 Points)
OBDtech2 (165 Points)
corvette-78 (125 Points)
knowledge 1488 (124 Points)
Samat Bekov (117 Points)
ptl (113 Points)
sabtele (112 Points)

what can cause an error code C1203?

The engine light turned on and that was the error after picking it up from a dealership.

Vehicle: 2003 toyota sequoia v8
asked Aug 19, 2013 by anonymous

1 Answer

C1203 ECM communication circuit malfunction

What should be check first is brake fluid level,a low brake fluid level switch can set this code ,the TRAC and VSC use this information for the skid control module, If the fluid is full you have a open circuit in the harness between the ECM to the skid control ECU.
answered Aug 20, 2013 by Reynaldo (2,637 points)

Related questions

1 answer
68 views asked Nov 13, 2013 by kamssu
1 answer
82 views asked Nov 6, 2013 by anonymous
...