Chevrolet Aveo LT ABS signal staying. DTC code shown C1604- ECU Malfunction ?

First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0110
DTC C0131
DTC C0161
DTC C0186
DTC C0196
DTC C0201
DTC C0240
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0245
DTC C0283
DTC C0287
DTC C0290 or C0292
DTC C0455
DTC C0550
DTC C0558

Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit

C1604-ECU Brake System hardware error/fault

not sure reset the system maybe..

The brake light switch could be bad try replacing it Hyundai had a major recal on their vehicles due to a faulty brake light switch. contact your closest Hyundai dealership with the model and vin number of your vehicle and see if your car is on the list of recals if not you can try replacing the switch yourself. Here's a link to your problem code that says it could possibly be your scc switch. http://www.autohex.net/dtc-help/hyundai/6/2010/5458/C1604/

Do you know what DTC'S - diagnostic trouble codes are ? Your best bet have it diagnosed by someone who has a diagnostic tool that can read these type codes . The light's on , codes are stored . 4X4 control module . Could be any number of thing's , you prepaired to by a bunch of parts till it's fixed ? Maybe !!!!!
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error

The 4X4 switch is input to the transfer case control module . The transfer case control module controls the transfer case encoder motor . Then there is the front drive axle clutch solenoid an front axle switch etc .. etc... etc...

The ESP system means the Electronic Stability Program. If the ESP lights on the dashboard permanently the ESP system is faulty.
You should access the ESP Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: brake pedal switch, front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ESP ECU, in other words reset the ESP system and turn off the warning lamp on dashboard.

Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you should access the ABS & ESP ECU (Electronic Control Unit) using diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored.
Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC stocked inside ABS & ESP ECU, and reset it.

Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you might access the ABS ECU (Electronic Control Unit) using diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored.
Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC stocked inside ABS ECU & reset it.

Chevrolet OBD Fault Codes
DTC P1680 - Driver 5 (ECU malfunction)

This is any internal ECU problem (ECU = ECM = PCM device); check other details HERE; keep in mind that its possible that you have to reprogramm the ECU.

Here is a bulletin for this problem.Subject: Service Engine Soon Light On, P1680 (Reprogram or Replace PCM)

Models:
2004 Buick Rainier
2004 Chevrolet Trailblazer
2004 GMC Envoy
2004 Oldsmobile Bravada with 4.2L Engine (VIN S - RPO LL8)

Some customers may comment on the Service Engine Soon Light coming on. Upon investigation, the technician may find a P1680 diagnostic trouble code Check the resistance of the accelerator pedal position sensors using the procedure in the appropriate Service Information for DTC P1680.

If the resistance of the accelerator pedal position sensor is within the specifications shown in the Service Information and the vehicle was built prior to the following VIN breakpoints, then reprogram the PCM with the latest calibration.

If the resistance of the accelerator pedal position sensor is within the specifications shown in the Service Information and the vehicle was built after the following VIN breakpoints, then replace the PCM. If the resistance of the accelerator pedal position sensor is outside the specifications shown in the Service Information, then continue with the diagnostics for DTC P1680.

VIN Breakpoints
• Vehicles built at Oklahoma City Assembly Plant - 46192755
• Vehicles built at Moraine Assembly Plant - 42315833

Hope this help

This truck probably has Rear Wheel Anti-Lock (RWAL) brakes. There is a small black module near master cylinder that is the brain for this system. There are ways to check for diagnostic trouble codes in this system. Once you have any codes set, diagnosis can be fairly simple. PROCEDURE:
Diagnostic Trouble Codes (DTC) 's can be displayed by jumping terminals "A" and "H" of the Data Link Connector and observing the flashing of the "BRAKE" warning light. This should only be done when the brake lamp is "ON".
The terminals must be jumped for about 20 seconds before the code will begin to flash. Count the number of short flashes starting from the long flash. Include the long flash as a count. Sometimes the first count sequence will be short. However, subsequent flashes will be accurate. If there is more than one failure, only the first recognized code will be retained and flashed.

NOTES:
DTC's 6, 9 and 10 will only turn the "BRAKE" lamp on while the fault exists. These are soft codes faults and can only be read with the Tech 1 scan tool.
Do not jump terminals "A" to "H" if the "BRAKE" lamp is not on. Jumping the terminals with the "BRAKE" lamp off will set a false DTC 9. This will turn the "BRAKE" lamp on and disable the antilock system.

1, 11, & 12 ECU Malfunction

2 Open Isolation Valve or Malfunctioning ECU

3 Open Dump Valve or ECU Malfunction

4 Grounded Antilock Valve Reset Switch

5 Eccessive Actuations of the Dump Valve

6 Erratic Speed Signal

7 Shorted Isolation Valve or Faulty ECU

8 Shorted Dump Valve or Faulty ECU

9 Open Circuit to Speed Signal

10 Brake Lamp Switch Circuit

13, 14 and 15 ECU Malfunction

Here are all the possible problems which can turn on your ABS light.

C1101 Battery voltage over volt: 18V or more ○ ○ BR - 69
C1102 Battery voltage low volt: 9.5V or less ○ ○ BR - 69
C1200 FL wheel sensor: open or short to ground ○ ○ BR - 66
C1201 - Range/Performance: speed jump or damaged exciter ○ ○ BR - 67
C1202 - No signal: air-gap error or wrong excite ○ ○ BR - 68
C1203 FR wheel sensor: open or short to ground ○ ○ BR - 66
C1204 - Range/Performance: speed jump or damaged exciter ○ ○ BR - 67
C1205 - No signal excite: air-gap error or wrong excite ○ ○ BR - 68
C1206 RL wheel sensor: open or short to ground ○ ○ BR - 66
C1207 - Range/Performance: speed jump or damaged exciter ○ ○ BR - 67
C1208 - No signal excite: air-gap error or wrong excite ○ ○ BR - 68
C1209 RR wheel sensor: open or short to ground ○ ○ BR - 66
C1210 - Range/Performance: speed jump or damaged exciter ○ ○ BR - 67
C1211 No signal: air-gap error or wrong excite ○ ○ BR - 68
C1604 ECU hardware: ECU internal or valve failure ○ ○ BR - 70
C2112 Valve relay: valve relay or fuse failure ○ ○ BR - 70
C2402 Motor-Electrical: open or short to battery, motor relay, fuse or motor lock fail ○ ○ BR - 71
C1503 TCS switch failure δ ○
C1605 CAN Hardware failure δ ○ BR - 71
C1610 CAN Bus off failure δ ○ BR - 71
C1611 EMS Time-out failure δ ○ BR - 71
C1612 TCM Time-out failure δ ○ BR - 71
C1613 TCM Un-matching failure δ ○ BR - 71
C2227 Brake disc overheat δ ○
C1274 G-Sensor signal fail (only 4WD) ○ ○ BR - 72
C1275 G-Sensor open or short to ground (only 4WD) ○ ○ BR - 72
You'll need a scanner which is compatible with Hyundai's ABS system to retrieve any DTC's (Diagnostic Trouble Codes) stored in its computer. Any time the ABS light comes on, there's a DTC stored in its computer - that code will tell you where the problem exists. Then you can go from there.