Copyright © 1998 General Motors Corp. 6–69
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Main code 42 indicates the ECU has detected a short-to-battery condition in a solenoid wiring circuit. Solenoids F
and K have a second driver on the low (ground) side which can turn off the solenoid. All other solenoids have a
driver only on the high (power) side of the solenoid. Even though the driver can be turned off, a stuck solenoid is
shorted-to-battery which means it is continuously powered at an unregulated 12V or 24V instead of a regulated
(pulse width modulated) voltage. A power-side driven solenoid stuck closed will not allow current regulation and
the same code will occur. Eventually, the solenoid coil will burn up and become open. If the vehicle is turned off
and restarted, a Code 41 XX occurs in early units and a Code 45 XX in later units.
NOTE: For subcodes 12, 13, 14, 15, 16, 22 — neutral start is inoperable; all display segments are on if the
code is logged during ECU initialization (ignition on). Subcodes 21, 23, 24, 25, and 26 will not trigger
the DO NOT SHIFT light.
NOTE: If solenoid resistance is about 1–2 Ohms, a short-to-ground code may not be set but could cause a
burned-out solenoid driver in the ECU. Replace the solenoid when this occurs (see appropriate
transmission Service Manual for replacement procedure). If the solenoid driver is burned out, 69 XX
codes will be set. See the troubleshooting procedure for 69 XX codes.
Active Indicator Clearing Procedure:
• Power down
• Manual
NOTE: Intermittent connections or lack of battery-direct power and ground connections may cause this and
other codes.
NOTE: The retarder accumulator solenoid (“H”) has a 30 Ohm coil. Since “H” solenoid is not mounted in
the sump, no relationship between temperature and resistance is required.
NOTE: Before troubleshooting, read Pages 6–17 and 6–18 of Section 6–5. Also, check battery and ECU input
voltages.
NOTE: Energizing the solenoids and listening for ball/plunger movement is sometimes useful in
troubleshooting.
Main
Code
Subcode Meaning
42 12 Short-to-Battery A Solenoid Circuit
42 13 Short-to-Battery B Solenoid Circuit
42 14 Short-to-Battery C Solenoid Circuit
42 15 Short-to-Battery D Solenoid Circuit
42 16 Short-to-Battery E Solenoid Circuit
42 21 Short-to-Battery F Solenoid Circuit
42 22 Short-to-Battery G Solenoid Circuit
42 23 Short-to-Battery H Solenoid Circuit
42 24 Short-to-Battery J Solenoid Circuit
42 25 Short-to-Battery K Solenoid Circuit
42 26 Short-to-Battery N Solenoid Circuit
CODE 42 XX — SHORT-TO-BATTERY IN SOLENOID CIRCUIT
(Figures 6–24, 6–25)
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